Vice President JD Vance invited television cameras into his official White House office this afternoon for an episode of Charlie Kirk’s podcast. He said he was guest-hosting the show to honor Kirk, the right-wing activist who was assassinated last week.

During the show, Vance invited some of the highest-ranking members of the Trump administration to praise Kirk and to lay out their plans in response to his killing. Making broad and unsubstantiated claims about their political opponents, the officials said they would bring the weight of the federal government down on what they claimed was a network of left-wing groups that incited violence.

Separately, two senior administration officials told The Times that cabinet secretaries and federal department heads were working to identify organizations that funded or supported violence against conservatives. One official said the Trump administration would look for links between liberal groups and episodes such as the recent burning of Teslas and assaults against immigration agents.

In Utah, investigators were still working to identify a motive in Kirk’s killing. The state’s governor has said that the suspect had a “leftist ideology” and that he acted alone. The director of the F.B.I. said today that the authorities had found physical evidence connecting the suspect in custody with the shooting of Kirk, including a note that was destroyed but later reconstructed.

Related: A Washington Post columnist said she was fired for her social media posts after Kirk’s killing.