Sen. Lamar Alexander, R-Tenn., a key impeachment swing vote, announced Thursday that he will not join Democrats in voting to call witnesses in President Donald Trump’s Senate impeachment trial, suggesting that there may not be enough GOP votes for the trial to advance to that next stage.

“I worked with other senators to make sure that we have the right to ask for more documents and witnesses, but there is no need for more evidence to prove something that has already been proven and that does not meet the U.S. Constitution’s high bar for an impeachable offense,” he said on Twitter.

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