The fate of key votes in President Trump’s impeachment trial remained uncertain Tuesday as his defense lawyers concluded their arguments and Republicans led by Senate Majority Leader Mitch McConnell struggled to muster the votes to bring the trial to a speedy close without calling witnesses.

But even as McConnell struggled to corral Republicans, Sen. Dianne Feinstein seemed to signal fissures in the unity of Senate Democrats. Feinstein suggested that while she had serious concerns about Trump’s character, she is still weighing her ultimate vote on whether to acquit him.