WASHINGTON — Trump administration officials on Monday responded to activist Charlie Kirk’s assassination by threatening to bring the weight of the federal government down on what they alleged was a left-wing network that funds and incites violence, seizing on the killing to make broad and unsubstantiated claims about their political opponents.

Investigators were still working to identify a motive in Kirk’s killing, but the Republican governor of Utah, Spencer Cox, has said that the suspect had a “leftist ideology” and that he acted alone.

The White House and President Donald Trump’s allies suggested that he was part of a coordinated movement that was fomenting violence against conservatives — without presenting evidence that such a network existed. America has seen a wave of violence acr

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