GOP Debate on Impeachment Witnesses Intensifies as Pelosi Prepares to Send Articles to Senate

The impeachment trial of President Trump is anticipated to proceed this week, as House Speaker Nancy Pelosi is expected to send the two articles of impeachment to the Senate as early as Wednesday. The House impeached Trump in December for abuse of power and obstruction of Congress related to Trump's effort to pressure Ukraine to investigate his political rival Joe Biden. A growing number of Republican senators are pushing for Senate Majority Leader Mitch McConnell to hold a vote on whether to allow witnesses to speak at the Senate trial. The timing of the Senate impeachment trial could impact the 2020 presidential race. Three Democratic candidates - Senators Bernie Sanders, Elizabeth Warren and Amy Klobuchar - will have to leave the campaign trail for the trial, which could begin this week. On Monday, Senator Cory Booker dropped out of the race in part because of the time demands of the impeachment trial. We speak with Dahlia Lithwick, senior editor at Slate.com, where she is their senior legal correspondent and Supreme Court reporter. Dahlia also hosts the podcast "Amicus."