White House press secretary Karoline Leavitt, at Thursday's press briefing, discussed the ongoing investigation into the shooting at Annunciation Catholic School in Minneapolis, Minnestoa.

One reporter asked if the administration believed the shooter's gender identity should be part of that investigation.

"All of the elements are being investigated in the shooting. Absolutely. Which is why part of the reason the FBI director came out and immediately confirmed that facet of the investigation," Leavitt said.

White House press secretary Karoline Leavitt on Thursday said President Donald Trump "fired" Centers for Disease Control and Prevention Director Susan Monarez and that her replacement will be announced "soon."

"What I will say about this individual is that her lawyers' statement made it abundantly clear themselves that she was not aligned with the president's mission to make America healthy again," Leavitt said. "And the secretary asked her to resign. She said she would, and then she said she wouldn't. So the president fired her, which he has every right to do."

"It was President Trump who was overwhelmingly reelected on Nov. 5. This woman has never received a vote in her life. And the president has the authority to fire those who are not aligned with his mission. A new replacement will be announced by either the president or the secretary very soon," Leavitt said.

Lawyers for Monarez said on Wednesday evening that she wouldn't leave her post as the top public health official, and argued that because she was appointed by Trump to the post that Trump personally had to dismiss her.

Trump has not weighed in himself on the dispute.

HHS Secretary Robert F. Kennedy Jr. will testify before the Senate Finance Committee next week, two aides confirmed to ABC News. It is scheduled to focus on "The President's 2026 Health Care Agenda."

It's unclear if the hearing was in the works before the recent staffing shakeups at the Centers for Disease Control and Prevention, but Democrats on the panel are likely to focus their questions on the White House's recent efforts to oust CDC Director Susan Monarez and other high-profile departures at the agency.

The hearing will come as a number of Democrats are calling for Kennedy's resignation.

The Senate returns to Washington from its monthlong August recess on Tuesday. The Senate Finance Committee hearing is scheduled for Thursday, Sept. 4, at 10 a.m. ET.

-ABC News' Allison Pecorin

Federal Reserve governor Lisa Cook on Thursday sued President Donald Trump over his attempt to fire her from the Board of Governors, challenging the effort and asking a judge to block it.

The suit, filed in the D.C. district court, also names Chairman Jerome Powell, and the Board of Governors as defendants.

-ABC News' Olivia Rubin