President Trump is set to remove IRS Commissioner Billy Long, a former GOP congressman confirmed by the Senate earlier this summer, multiple sources familiar with the matter told ABC News.

Long confirmed the move in an X post Friday afternoon, revealing that Trump tapped him to be the ambassador to Iceland.

"I am thrilled to answer his call to service and deeply committed to advancing his bold agenda. Exciting times ahead!" he posted.

In an email Thursday with the subject line "It's Almost FriYay," Long encouraged staffers to leave work early on Friday.

Treasury Secretary Scott Bessent is slated to lead the agency in an interim capacity, sources told ABC News. He would be the sixth leader of the tax-collecting agency in the first eight months of the Trump administration.

Long, a former GOP congressman and auctioneer, supported disbanding the agency as a member of Congress. The agency has been brought into the Trump administration's efforts to use government records and data to help identify and deport undocumented immigrants working and living in the country.

A spokesperson for the Treasury Department thanked Long for his services in a statement, adding that "a new candidate for Commissioner will be announced at the appropriate time."

The New York Times first reported on Trump's plans to replace Long.

-ABC News' Benjamin Siegel, Katherine Faulders and Olivia Rubin

President Trump welcomed the presidents of Azerbaijan and Armenia outside the West Wing on Friday afternoon.

"Very confident," Trump responded when asked if there would be a deal between the two nations.

-ABC News' Kelsey Walsh

Vice President JD Vance confirmed that he discussed redistricting with government officials during his trip to Indiana during an interview with Maria Bartiromo on FOX News Channel’s "Sunday Morning Futures."

"We spoke with the governor, with the speaker of the House there in Indiana, and the Senate president, and the message I delivered is pretty straightforward," Vance said. "We want a unified Republican team. We want to fight together, win together, make big things happen for the American people, and obviously, the people of the state of Indiana together."

Vance indicated that because blue states such as California, Illinois and New York have "aggressively gerrymandered," it has become hard for states such as Indiana to have their voices heard in federal elections. He then claimed that California has more seats due to undocumented immigrants.

"They get rewarded for welcoming illegal aliens into their state, giving them federal benefits, actually asking the taxpayers of states like Ohio to subsidize them. And then those same taxpayers in Ohio and Indiana and elsewhere, they have fewer congressional representatives because of what California has allowed to happen. That's ridiculously unfair," he said.

-ABC News' Kelsey Walsh

In a social media post on Friday, President Trump said that his global tariffs are "having a huge positive impact on the Stock Market" and is calling on an appeals court weighing the legality of the tariffs not to rule against the duties.

"If a Radical Left Court ruled against us at this late date, in an attempt to bring down or disturb the largest amount of money, wealth creation and influence the U.S.A. has ever seen, it would be impossible to ever recover, or pay back, these massive sums of money and honor. It would be 1929 all over again, a GREAT DEPRESSION!," Trump wrote in a post on his conservative social media platform, Truth Social.

The post comes as a federal appeals court considers whether to uphold the New York-based Court of International Trade's ruling that Trump does not have the authority to unilaterally impose tariffs on most of America's trading partners.

-ABC News' Michelle Stoddart