\"We think part of this might be that people heeded the early data coming out of China and coming out of South Korea, that the elderly or those with pre-existing medical conditions were at particular risk,\" she said.

Birx went on to again implore the millennial generation to follow the government's social distancing guidance.

\"So, again, not only calling on you to heed what is in the guidance, but to really ensure that each and every one of you are protecting each other.\"

She also took a moment to address the mortality rate.

\"If you look at all of the countries to date, the mortality is higher at the beginning because you are diagnosing the sickest, the ones who came in quite ill,\" Birx continued on Wednesday. \"You are seeing mortality or deaths today from infections that occurred 2-3 weeks ago, in general.\"

Dr. Anthony Fauci, the nation's leading expert on infectious diseases cautioned Tuesday it will take \"several weeks and maybe longer until we know we're having an effect,\" on slowing the spread of the virus but said if Americans follow the 15-day guidelines, young people especially, \"we're going to see a hump instead of a peak.\"

Trump says self-swab testing is being developed

\"Today I can announce further steps expand testing capacity. We are working with several groups to determine if the self-swab, the much easier process than the current process that is not very nice to do. I can tell you, because I did it it,\" Trump said.

He said that it \"would be administered also by a health official, but it would be a lot easier to do.\"

Later, he clarified that the FDA has not approved the self-swab test he mentioned at the start of the briefing, but \"they are looking down the line and they are looking at it very seriously.\"

Proceeding to again blame previous administrations, Trump said, \"Nothing has been so contagious. The level of contagion has been incredible, actually. Nobody's seen anything quite like this.\"

President Trump announces \"further steps to enhance testing capacity.\"

\"We have a current process that’s a little bit difficult … we’re going to see if we can do a self swab, which would be a lot more popular.\" https://t.co/vH4igOYamd pic.twitter.com/JRQlvyNK6Y

— ABC News Politics (@ABCPolitics) March 18, 2020

\"We've inherited a very obsolete system. This was a system that was out of date, obsolete, it was a system that was never meant to take care of the kind of quantity.\"

\"If you go back to years past, even recently, like the flu -- nobody had tests before. They didn't test the entire nation to see whether or not they had the flu. They got the flu. They got better,\" Trump said. \"Now all now all of a sudden they do this very complex testing.\"

\"PHOTO:
Brendan Smialowski/AFP via Getty Images
PHOTO: President Donald Trump speaks during the daily briefing on the novel coronavirus, COVID-19, at the White House, March 18, 2020, in Washington.
>

Trump pressed on calling disease \"Chinese Virus'

Asked by ABC News Senior White House Correspondent Cecelia Vega if his use of the term \"Chinese Virus\" is racist, Trump said, \"it's not racist at all.\"

\"It comes from China, that's why. It comes from China. I want to be accurate,\" he continued. \"China tried to say at one point that -- maybe they've stopped now, that it was caused by American soldiers. That can't happen. It's not going to happen. Not as long as I'm president. It comes from China.\"

President Trump defends his use of \"Chinese virus\" to refer to COVID-19, telling @CeciliaVega it is \"not racist at all.\"

The use of the term has been under scrutiny amid reported incidents of bias against Asian Americans. https://t.co/vH4igOYamd pic.twitter.com/3RWeyvRPDC

— ABC News Politics (@ABCPolitics) March 18, 2020

Asked whether he thought China should be \"punished,\" Trump answered, \"I don't know if you would say China is to blame. Certainly, we didn't get an early run on it,\" Trump said. \"It would have been helpful if we knew about it earlier. But it comes from China. It's not a question.\"

When Vega asked him to clarify, Trump said, \"I don't believe they are inflicting\" the virus on the U.S., but \"I think they could have given us a lot earlier notice, absolutely.\"

\"We would have had a lot of dead people like we haven't seen before,\" Trump said, if he hadn't acted to limit travel from China.

Trump says 20 percent unemployment is \"total worst case\"

Trump also told Vega that a potential 20 percent unemployment rate, as floated by Treasury Secretary Steven Mnuchin as an argument to Senate Republicans to get a stimulus package passed quickly, is a \"total worst case\" scenario and that the U.S. is \"nowhere near it.\"

\"Well, I don't agree with that. No, I don't agree, Trump said. \"That's an absolute, total worst-case scenario. No, we don't look at that at all. We are nowhere near it.\"

\"We had the best economy we've ever had, and then one day you have to close it down in order to defeat this enemy. But we are doing it, and we are doing it well. I tell you, the American people have been incredible. For the most part they been really incredible.\"

\"When I use the word 'calm,' that doesn't mean I'm not taking it seriously. We should be calm. We should be extremely calm,\" Trump said, amid criticism that his administration didn't take the virus seriously from the onset, inhibiting the government's response to it.

\"PHOTO:
Evan Vucci/AP
PHOTO: President Donald Trump listens during press briefing with the Coronavirus Task Force, at the White House, March 18, 2020.
>

Trump says he will use crisis powers to stop asylum seekers at southern border; US and Canada close close border

He also said at the briefing he planned to invoke a provision of the federal legal code that would allow the federal government to prohibit the entry of asylum seekers because of COVID-19.

\"42 U.S. Code § 265\" lets the U.S. Surgeon General block people from entering the country to fight the risk of a \"communicable disease.\"

Asked if he’d invoke that, Trump replied, \"The answer is yes.\"

He said that would happen \"very soon, probably today.\"

Trump said he didn’t plan to close the U.S. border with Mexico like he did with Canada.

\"No, we’re not going to close it. But we are invoking a certain provision that will allow us great latitude as to what we do,\" Trump said.

President Trump tweeted Wednesday morning that by \"mutual consent\" the U.S. will be temporarily closing the northern border with Canada to non-essential traffic, adding that trade will not be affected.

We will be, by mutual consent, temporarily closing our Northern Border with Canada to non-essential traffic. Trade will not be affected. Details to follow!

— Donald J. Trump (@realDonaldTrump) March 18, 2020

Trump teases big announcement on the FDA, stimulus checks to American people

During his opening remarks at a meeting with members of the White House coronavirus task force and representatives of American nurses in the late afternoon, Trump announced his news conference on new measures the Food and Drug Administration is taking in the \"war\" again coronavirus will take place Thursday.

Earlier Wednesday, Trump tweeted about \"very important news from the FDA\" and touted his response to the novel coronavirus -- telling Americans, \"money will soon be coming to you\" -- after the White House proposed a $1 trillion economic stimulus package, including a measure to send checks to directly to Americans.

For the people that are now out of work because of the important and necessary containment policies, for instance the shutting down of hotels, bars and restaurants, money will soon be coming to you. The onslaught of the Chinese Virus is not your fault! Will be stronger than ever!

— Donald J. Trump (@realDonaldTrump) March 18, 2020

The White House late Tuesday night also requested $45.8 billion more from Congress -- in addition to the trillion-dollar package currently being negotiated -- in order to cover unanticipated costs for an array of federal agencies fighting COVID-19.

The $1 trillion stimulus spending breaks down as follow: $500 billion for two rounds of $250 billion of direct payments for Americans to go out around April 6 and May 18; $300 billion to help small businesses meet payroll; $50 billion for the airlines; and $150 billion for loans and loan guarantees for other parts of the economy.

Trump continues to call COVID-19 \"the Chinese Virus\" in tweets

In a series of Wednesday morning tweets, the president continued to referred to the novel coronavirus as \"the Chinese Virus\" -- despite the Chinese government criticizing the terminology and his own health officials warning that doing so promotes hate incidents against Asians.

I always treated the Chinese Virus very seriously, and have done a very good job from the beginning, including my very early decision to close the \"borders\" from China - against the wishes of almost all. Many lives were saved. The Fake News new narrative is disgraceful & false!

— Donald J. Trump (@realDonaldTrump) March 18, 2020

Secretary of Health and Human Services Alex Azar told Congress last month, \"Ethnicity is not what causes the novel coronavirus.\"

Census pulls back on field operations for at least two weeks

Just one week after the 2020 census officially kicked off and invitations arrived in U.S. mailboxes, the bureau announced it’s having to pause field operations for two weeks.

\"In late May, census takers around the nation will begin visiting households that have not yet responded to the 2020 Census to help complete the count,\" the Census Bureau said in a statement. \"As we continue to monitor the evolving COVID-19 outbreak, we will adjust census taker and survey operations as necessary in order to follow the guidance of federal, state and local health authorities.\"

The statement went on to encourage the public to respond to the census online, by phone or mail.

City leaders encourage colleagues and communities to act responsibly

The president of the National League of Cities, Los Angeles City Councilmember Joe Buscaino, is demanding action from local leaders as calls have intensified to stem the coronavirus crisis now playing out across the globe.

Buscaino, in a statement to ABC News, called on his fellow leaders from coast to coast to lead the charge in curbing COVID-19’s spread, and encourage their communities to act responsibly.

“Local leaders across America are on the front lines of this unprecedented crisis,” Buscaino said. “I implore those cities who have not taken action, to immediately take steps to close schools, restrict access to public spaces, and ask people to ‘shelter in place.’”

“This is not a drill. We must act urgently.”

An aide familiar with the League said an alarm must be sounded to compel colleagues to act with a greater sense of exigence.

It comes just days after multiple sources told ABC News an emergency meeting to work on a resolution asking the Trump administration to call for a national shutdown of in-dining restaurants and bars did not come to fruition for the group.

Buscaino now looks to “lead with urgency,” calling for FEMA and the Army Corps of Engineer to build infrastructures for additional intensive care unit beds that may soon be of vital need.

What to know about coronavirus:

ABC News' Anne Flaherty, Ben Gittleson, Jordyn Phelps, Sasha Pezenik and Jack Arnholz contributed to this report.

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