Even as cases in Washington, D.C., continue to rise, the Senate reconvenes Monday, and lawmakers are supposed wear masks and take other social distancing precautions. The standoff over liability protections and fight over aid to state and local governments continues.

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Oliver Contreras/Pool/ABACA via Newscom
PHOTO: President Donald Trump speaks during a Virtual Town Hall inside of the Lincoln Memorial in Washington, DC., on May 3, 2020.
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Here are Monday's most significant developments in Washington:

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Bill Clark/CQ Roll Call via AP
PHOTO: Architect of the Capitol workers wearing face masks walk past a sign advising people observe social distancing in the Russell Senate Office Building on Monday, May 4, 2020., in Washington.
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Here are the latest developments in the government response:

The Senate reconvenes as coronavirus divides lawmakers

Senators returned to the Capitol Hill in full force Monday for the first time since March 26, facing a full slate of coronavirus-related concerns and partisan disagreements on how to handle it.

Senate Majority Leader Mitch McConnell defended his decision to call lawmakers back, saying from the Senate floor: \"This deadly coronavirus does not take days off. And so the United States Senate has not either.\"

\"I don't think anybody could show us they argue that filling critical national security posts is not essential Senate business,\" McConnell said, confirming that federal appointments will be a priority for the Senate in the coming weeks.

The Senate is back in session because we have critically important work to do for the nation. Our bosses are the American people and they are counting on us to keep serving.

— Leader McConnell (@senatemajldr) May 4, 2020

But Minority Leader Chuck Schumer questioned McConnell on his motivations for rushing members back to the Capitol in the middle of a pandemic, claiming the leader's top priority is appointing conservative judges.

\"If we are going to make these fine people come into work in these conditions,\" Schumer said, speaking of other employees on Capitol Hill, \"let the Senate at least conduct the nation's business and focus like a laser on COVID-19. At the moment, the Republican leader has scheduled no significant COVID-related business for the floor of the Senate.\"

\"PHOTO:
Leah Millis/Reuters
PHOTO: Senate Majority Leader Mitch McConnell walks inside the U.S. Capitol as senators returned to Capitol Hill in Washington, May 4, 2020.
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Some senators, including McConnell, were seen in masks walking to and from the chamber.

For their first order of business, the Senate debated the nomination of Robert Feitel to be Inspector General of the Nuclear Regulatory Commission. A final confirmation vote is expected later Monday.

The House, meanwhile, continues to weigh a return of its full membership as early as next week.

Mnuchin says $175B of Paycheck Protection Program money used

Treasury Secretary Steven Mnuchin, in a phone interview with Fox Business Monday, said that $175 billion of the second tranche of money allocated to the Paycheck Protection Program has been allocated and that there have been 2.2 million loans at an average size of $79,000.

He acknowledged there were some hiccups with the system but said they \"couldn't be more pleased\" with the impact, with 60 million set to benefit.

The fund is more the half way spent.

Asked about the potential for international travel to restart later this year, Mnuchin said it's \"too hard to tell at this point\" when international travel will restart but encouraged Americans to plan domestic trips.

\"This is a great time for people to explore America,\" Mnuchin said.

ABC News' Jordyn Phelps and Sarah Kolinovksy

SCOTUS holds first oral arguments via teleconference

The U.S. Supreme Court on Monday is livestreaming its first-ever telephonic oral arguments, a high-stakes endeavor prompted by the historic disruption to court operations during the coronavirus pandemic

Millions of Americans will for the first time were able to experience the nine justices together at work -- a virtual civics lesson on an entire branch of U.S. government that conducts most of its work out of the public eye.

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STOCK PHOTO/Getty Images
PHOTO: An undated photo shows the U.S. Supreme Court building in Washington, D.C.
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It's also the first opportunity for a sitting American president -- one who is party to cases before the court -- to tune in live and potentially respond via Twitter.

The high court will hear 10 cases by phone over the coming weeks.

Urgent deadlines in several cases, including President Trump's appeal of subpoenas for his financial records -- which expires at the end of the year -- required the court to devise a new way of doing business in the near term.

ABC News' Devin Dwyer

FDA revises policy on antibody tests

The Food and Drug Administration has updated what is required to start using antibody tests.

It says early on they allowed more flexibility for labs to use their own antibody tests because that was necessary.

Now they want labs and companies to seek emergency authorization and provide validation that their test works within 10 days of starting.

Under this revised policy, the FDA has outlined the following expectations for antibody test developers:

\"Commercial manufacturers will submit EUA (emergency use authorization) requests, with their validation data, within 10 business days from the date they notified the FDA of their validation testing or from the date of this policy, whichever is later. Furthermore, the FDA has provided specific performance threshold recommendations for specificity and sensitivity for all serology test developers,\" the statement released Monday said.

ABC News' Eric Strauss

What to know about coronavirus:

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