President Donald Trump posted on Truth Social that his tariff letters "and/or deals" will be delivered to "various countries from around the world," on Monday, starting at 12 p.m ET.

Currently, it is unknown which nations will be receiving the letter and/or deal.

"I am pleased to announce that the UNITED STATES TARIFF Letters, and/or Deals, with various Countries from around the World, will be delivered starting 12:00 P.M. (Eastern), Monday, July 7th," Trump said. "Thank you for your attention to this matter! DONALD J. TRUMP, President of The United States of America."

Shortly thereafter, Trump posted that any nation that aligns itself with the "anti-American policies of BRICS" will be charged an additional 10% tariff, and that there will be "no exceptions" to the countries that are hit with this "BRICS tariff."

BRICS members include Brazil, Russia, India, China, South Africa, Egypt, Ethiopia, Indonesia, Iran, Saudi Arabia, and the United Arab Emirates.

Nations that are considered "partner states" include Belarus, Bolivia, Cuba, Kazakhstan, Malaysia, Nigeria, Thailand, Uganda, Uzbekistan, and Vietnam.

-ABC News' Alex Ederson

In a lengthy post on his social media platform on Sunday, President Donald Trump wrote that Elon Musk is becoming a "TRAIN WRECK," explaining their differences on EV mandates and why he pulled the nomination of Musk's associate to lead NASA.

"I am saddened to watch Elon Musk go completely 'off the rails,' essentially becoming a TRAIN WRECK over the past five weeks," Trump wrote in a post after Musk announced he was starting a new political party.

Trump then claimed that Musk told him he had "no problems" with him ending subsidies for electric vehicle purchases.

"No more EV Mandate. I have campaigned on this for two years and, quite honestly, when Elon gave me his total and unquestioned Endorsement, I asked him whether or not he knew that I was going to terminate the EV Mandate - It was in every speech I made, and in every conversation I had. He said he had no problems with that - I was very surprised!" Trump wrote.

The president went on to argue that he felt that it was in the best interest of the American public not to have Musk associate Jared Isaacman lead NASA due to their space industry connections.

"I also thought it inappropriate that a very close friend of Elon, who was in the Space Business, run NASA, when NASA is such a big part of Elon’s corporate life. My Number One charge is to protect the American Public!" Trump added.

-ABC News' Lalee Ibssa

President Donald Trump said Elon Musk "can have fun with it" when asked about the billionaire's announcement that he will start a new political party, but called it "ridiculous" and said it will create more confusion for voters.

“I think it's ridiculous to start a third party,” Trump said.

“I think starting a third party just adds to confusion. It really seems to have been developed for two parties. Third parties have never worked, so he can have fun with it, but I think it's ridiculous," the president said.

-ABC News' Lalee Ibssa and Hannah Demissie

Following Elon Musk's announcement that he plans to create a third political party called the "America Party" in response to Trump's tax-cut and spending bill, Treasury Secretary Scott Bessent shaded the billionaire and former head of DOGE about his efforts.

"Look, the principles of DOGE were very popular. I think if you would look at the polling, Elon was not, so I believe that the boards of directors at his various companies wanted him to come back and run those companies, which he is better at than anyone," Bessent said on CNN. "So, I imagine that those board of directors did not like this announcement yesterday, and will be encouraging him to focus on his business activities, not his political activities."

-ABC News’ Hannah Demissie

As House members scramble to make their way back to the Capitol to vote on the Senate-passed Trump policy megabill, several have said their flights were canceled due to inclement weather -- which could create an attendance problem when the measure comes up for a final vote as early as Wednesday.

Wisconsin Democrat Mark Pocan posted a video on X: a video on X: “Hi, I am at the airport in Madison and my flight just got canceled due to thunderstorms going to D.C. So, I am driving to Chicago hoping to get one of the first flights 6 a.m. tomorrow. This is part of the glamorous life of Congress.”

Illinois Democrat Raja Krishnamoorthi said he’s hosting a pop-up Zoom town hall from his car as he drives to D.C. since his flight was canceled. “My flight was canceled, so I’m hosting a pop-up Zoom town hall from the car as I drive to D.C. to vote NO on Trump’s “Large Lousy Law,” a budget that guts Medicaid & slashes our safety net to fund tax cuts for the wealthiest,” he said in a post on X.

South Carolina Republican Nancy Mace said in a post on X: “Both my flights to DC, one for tonight and one for early tomorrow morning have been canceled by the airline. sigh Scrambling to find a way to get to DC in time to vote for the Big Beautiful Bill.”

Her fellow South Carolina Republican Russell Fry posted a video on X of him in the car heading back to D.C.

“I am not going to chance being stuck in Myrtle Beach for this historic opportunity,” he said. I am getting in the car right now. We are just leaving town and we are gonna drive all the way through until we get to Washington, DC tonight. The moment is too important to sit around and wait in an airport. Let’s go deliver on President Trump’s agenda… I am going to have one big, beautiful road trip,” he said.

-ABC News’ Lauren Peller and Lalee Ibssa