White House says some employees were fired by mistake

As DOGE continues to work its way through Washington, D.C., a young member of the team is at the IRS headquarters today, according to multiple sources familiar with the visit.

The aide arrived at the headquarters today and has initiated multiple meetings with IRS employees, the sources said. In part, they have been asking about the agency’s technology, including how audits and compliance are done.

Elon Musk has previously taken to X regarding the IRS, asking in a post earlier this month: "Would you like @DOGE to audit the IRS?"

The IRS is within the Department of Treasury, where DOGE staffers have been on site for weeks, as ABC News has previously reported. The visit also comes amid tax season.

The IRS did not immediately respond to ABC's request for comment.

-ABC News' Olivia Rubin, Will Steakin and Katherine Faulders

Addressing reporters in the Oval Office, President Donald Trump did not say in what capacity Elon Musk met with Indian Prime Minister Narendra Modi on Thursday.

Trump said he didn't know whether Musk met the prime minister as a businessman or as a representative of the U.S. government.

"Well, he's meeting with me in a little while, so I'm going to ask him that question," Trump said.

Hours after being narrowly confirmed by the Senate along party lines, Robert F. Kennedy Jr. was sworn in to serve as Trump's health and human services secretary.

Joining the ceremony at the White House was Trump, who called Kennedy a "friend" who will lead "historic reforms" in American health care.

"Immediately after Bobby is sworn in, I will be signing an executive order establishing the President's Commission to Make America Healthy Again," Trump said. "This groundbreaking commission will be charged with investigating what is causing the decades-long increase in chronic illness, reporting its findings and delivering an action plan to the American people."

A fourth federal judge on Thursday blocked President Donald Trump’s executive order ending birthright citizenship.

The ruling from U.S. District Judge Leo Sorokin in Massachusetts comes after three similar rulings by judges in New Hampshire, Seattle and Maryland.

"The plaintiffs are likely to succeed on the merits of their claims under the Citizenship Clause," Sorokin, an Obama appointee, said in his ruling. "They are likely to suffer irreparable harm in the absence of relief, the balance of harms tips overwhelmingly in their favor, and the public interest favors an injunction."

The two Massachusetts-based immigrant advocacy groups that filed the lawsuit last month argued that the principle of birthright citizenship is "enshrined in the Constitution" and that Trump does not have the authority to issue the order.

-ABC News' Peter Charalambous and Laura Romero