John R. Bolton, the former White House national security adviser, has announced that he is willing to give evidence in the impeachment trial of President Trump. The question is: Will the Senate — and the majority leader, Mitch McConnell — let that happen? Guest: Julie Hirschfeld Davis, the congressional editor of The New York Times. For more information on today’s episode, visit nytimes.com/thedaily.

Background reading:

• Mr. Bolton’s announcement was an unexpected turn that could alter the political dynamic of the impeachment process, raising the possibility of Republican defections.
• In response, Mr. McConnell said that he had the votes he needed to quickly acquit the president without calling witnesses or hearing new evidence.