Susan Collins

The fatal shooting of a Colombian man in Maine by an Immigration and Customs Enforcement agent has put pressure on Senator Susan Collins, with several of the Democrats seeking to challenge her criticizing her support for aspects of the Trump administration’s immigration agenda.

Ms. Collins sought to get ahead of the potentially damaging issue, saying Tuesday that after the shooting she had urged Markwayne Mullin, the Homeland Security secretary, to “cease all non-urgent vehicle stops,” which officials said the administration later did.

But several Democrats hoping to challenge Ms. Collins, a vulnerable five-term Republican, have seized on the incident, drawing attention to her votes to fund ICE and Customs and Border Protection and to confirm both of Mr. Trump’s second-term homeland security secretaries, Mr. Mullin and his predecessor, Kristi Noem.

Troy Jackson, a Democratic Senate candidate, said on social media Tuesday morning that ICE “must be abolished” and that “Susan Collins must be held accountable for funding this terror.”

Dr. Nirav Shah, another candidate, said there was a “straight line from Senator Collins to the tragedy that we saw yesterday.”

“Time and time again, she has handed ICE a blank check,” Dr. Shah said at a news conference on Tuesday outside Ms. Collins’s office in Biddeford. “What we have seen from Senator Collins is a pattern of enabling.”

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