Senators forced to leave campaign trail for impeachment trial

Four Democratic senators, including Bernie Sanders and Elizabeth Warren, are on Capitol Hill for Trump's trial as the remaining candidates in Iowa campaign ahead of the caucuses.
2:29 | 01/21/20

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Transcript for Senators forced to leave campaign trail for impeachment trial
As you know the impeachment trial is having a direct effect on the presidential campaign this morning. This morning four democratic candidates who are also senators are forced to leave the trail and head back to capitol hill. With just 13 days to go until the Iowa caucuses, the first votes in the nation and Eva pilgrim on the ground in des Moines, Iowa. Good morning, Eva. Reporter: Good morning, robin. Yeah, usually this close to the caucuses the candidates are nonstop here in Iowa. But not this time. The president's impeachment trial pulling several off the campaign trail. Time is ticking in the hawkeye state and adding pressure on at least some of the candidates, their duty in D.C. As jurors. I'm not going to be able to be here as much as I would like. So you guys are going to have to carry the ball. Reporter: Four candidates including top challengers Bernie Sanders and Elizabeth Warren returning to capitol hill this morning ready to take their seats in the senate for the start of the president's impeachment trial. But before leaving town, the Sanders campaign getting in one more swing against fellow front-runner Joe Biden blasting out an email to supporters quoting a column from a surrogate attacking the former vice president. Some think nominating Joe Biden, a moderate white man who calls himself middle class Joe, makes sense. But Biden has a big corruption problem, and it makes him a weak candidate. Overnight Sanders apologizing saying, it is absolutely not my view that Joe is corrupt in any way. And I'm sorry that op-ed appeared. In response, Biden thanked him for the apology tweeting, these kinds of attacks have no place in this primary. As Biden continues his own attacks questioning skandz' electability. Meanwhile in the midst of the fighting the candidates seeming to put aside their differences for a moment. A show of unity marching together at an mlk event in Columbia, South Carolina. Warren and Sanders even shaking hands and walking arm in arm just one week after a hot mic on the debate stage caught the candidates trading accusations that each called the other a liar. The longtime friends now attempting to move on before the votes are cast. And Joe Biden and Pete buttigieg both have -- are taking full advantage. They both have jam-packed schedules here today. Michael. All right, it's good to see some civility between the candidates. Thank you so much, Eva.

This transcript has been automatically generated and may not be 100% accurate.

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