Republicans lack votes to block witnesses

President Donald Trump’s impeachment trial is shifting to questions from senators, a pivotal juncture as Republicans lack the votes to block witnesses and face a potential setback in their hope of ending the trial with a quick acquittal.

After Trump’s defence team rested yesterday with a plea to ‘‘end now,’’ Senate Majority Leader Mitch McConnell privately told senators he doesn’t yet have the votes to brush back Democratic demands for witnesses now that revelations from John Bolton, the former national security adviser, have roiled the trial.

Bolton writes in a forthcoming book that Trump told him he wanted to withhold military aid from Ukraine until it helped with investigations into Democratic rival Joe Biden. That assertion, if true, would undercut a key defence argument and go to the heart of one of the two articles of impeachment against the president.

‘‘I think Bolton probably has something to offer us,’’ said Senator Lisa Murkowski, R-Alaska.

Not in Trump’s view. ‘‘Why didn’t John Bolton complain about this ‘nonsense’ a long time ago, when he was very publicly terminated,’’ Trump tweeted shortly after midnight. ‘‘He said, not that it matters, NOTHING!’’

The uncertainty about witnesses arises days before crucial votes on the issue. In a Senate split 53-47 in favour of Republicans, at least four GOP senators must join all Democrats to reach the 51 votes required to call witnesses, decide whom to call or do nearly anything else in the trial. Several Republicans apparently are ready to join Democrats in calling witnesses.

The two days set aside for questions, today and tomorrow, also allow each side more time to win over any undecided senators pondering the witness issue. In the meantime, all will have the opportunity to grill both the House Democrats prosecuting the case and the president’s defence team. –