On Tuesday, the Senate impeachment trial began in earnest, with hours of debate over how it should be run. Steve Kornacki explains the last-minute changes made by Senate Majority Leader Mitch McConnell, who amended his own set of rules in response to pressure from moderate Republican Senators.

Have a question about the Senate trial or something else impeachment-related? Email our host Steve Kornacki at articletwopodcast@gmail.com.