Explosive Bolton Book Allegations Spark New Calls for Witnesses to Testify at Impeachment Trial

Calls are growing for the Senate to call witnesses in President Trump's impeachment trial, after The New York Times published details about former national security adviser John Bolton's forthcoming book. In the book, Bolton writes that President Trump personally told him in August that he wanted to maintain a freeze on $391 million in security assistance to Ukraine until Ukraine turned over materials related to former Vice President Joe Biden and supporters of Hillary Clinton in Ukraine. The New York Times broke the story on Sunday, one day after President Trump's legal team began its defense of the president. During Saturday's opening arguments, White House deputy counsel Mike Purpura claimed the Democratic case for impeachment is based on assumptions, and Trump's attorney Pat Cipollone accused the Democrats of attempting to overturn an election. Trump's lawyers will continue their opening arguments Monday, after the Democratic House impeachment managers wrapped up their three days of opening arguments on Friday. We speak with Dan Friedman, a reporter in the D.C. bureau of Mother Jones who focuses on foreign influence and national security.