Trump admin updates: White House officials hold prayer vigil for Charlie Kirk

President Trump, departing the White House on Thursday, was asked if he's concerned for his safety after the killing of conservative activist Charlie Kirk.

"Not really," Trump said. "I'm really concerned for out country. We have a great country. We have a radical left group of lunatics out there, just absolute lunatics, and we're going to get that problem solved. I'm only concerned for the country."

Trump was asked how he wants to see his supporters respond to Kirk's murder.

"I think that the way he was, he was an advocate of nonviolence. That's the way I'd like to see people respond," Trump said.

Trump told reporters that he spoke with Charlie Kirk's widow Erika.

"She's devastated. She's absolutely devastated, as you can imagine," he said.

The Trump Administration is asking an appeals court to expedite its challenge to a lower court's order keeping Lisa Cook as a Federal Reserve Governor.

In a filing earlier Thursday, Department of Justice lawyers urged the D.C. Circuit to decide whether to stay the court order by Sept. 15 – one day ahead of the Federal Open Market Committee's scheduled meeting.

Earlier this week, U.S. District Judge Jia Cobb concluded that the allegations of mortgage fraud against Cook did not provide sufficient cause to remove her from her role, in part because the claims predate her time in office.

However, the Trump administration argued the allegations "at a minimum reflect a lack of care in financial matters that the President determined was inconsistent with Cook's holding a position of public financial trust on the Federal Reserve Board."

-ABC News' Peter Charalambous

The Democratic National Committee said U.S. Capitol Police responded to a potential bomb threat at its Washington headquarters on Thursday that was "determined not to be credible."

"Out of an abundance of caution, Capitol Police is conducting an interior sweep of the building. As DNC Chair Ken Martin has said, political violence in every form has no place in our country. We are grateful to the U.S. Capitol Police and DNC building security for responding quickly and professionally," a DNC spokesperson said.

Capitol Police told ABC News that officers immediately responded after they were notified of a potential bomb threat directed toward the DNC and were checking the building and surrounding areas.

"So far nothing has been found outside. We are checking inside of the building out of an abundance of caution," police said.

-ABC News' Brittany Shepherd and Beatrice Peterson