Senate Majority Leader Mitch McConnell has tried to insulate Republicans in case more damaging information comes out about President Donald Trump and swings public opinion, even as he lashes out at Democrats for pursuing an impeachment inquiry.

The Kentucky Republican has accused House Speaker Nancy Pelosi of caving to the Democratic “far left” in pursuing “a never-ending impeachment parade in search of a rationale.”

Still, he has yet to offer a vigorous public defense of Trump and his interactions with the Ukrainian president, which are at the center of the latest controversy. And he allowed passage of a resolution pushed by Democratic leader Chuck Schumer that urged the White House to let lawmakers see a whistle-blower’s complaint about the president’s actions.

Several Republican senators are following McConnell’s lead, offering circumspect reactions to the release of a White House memo of Trump’s call and the whistle-blower complaint that flagged it as potentially criminal. On Thursday, an increasingly common response from GOP senators was that they’re withholding judgment because they could be called upon to act as jurors if Trump is impeached in the House.

“The question that my House colleagues are having to contemplate right now is whether or not it rises to the level of a high crime or misdemeanor” necessary for impeachment, Senator Todd Young, a Republican from Indiana, said Thursday. “I’m a potential juror in this whole situation if they determine that it is. Jurors aren’t supposed to talk.”