Republican Sen. Mike Lee refused to take responsibility for his crass social media posts about the assassination of a Democratic lawmaker from Minnesota even after he was confronted by a Senate colleague.

The Republican senator from Utah suggested in social media posts that the killings were the work of “Marxists,” and mocked Minnesota’s Democratic governor. He later issued a more sober condemnation of the violence.

The suspect, 57-year-old Vance Boelter, was arrested late Sunday following a nearly two-day statewide search. The Saturday morning shootings left State Representative Melissa Hortman and her husband, Mark, dead, and wounded State Senator John Hoffman and his wife, Yvette.

The cohosts reacted to the allegedly politically-motivated violence that took place over the weekend and the response by a key official.