'This is going to be a very sad chapter of American history': Sen. Nelson

Republican and Democratic senators react to news of Michael Cohen's guilty plea for lying to Congress under oath.
2:07 | 11/29/18

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Transcript for 'This is going to be a very sad chapter of American history': Sen. Nelson
What he should lot of congress. Especially under oath this is one more example of one of the president's closest allies. Line. About their ties to Russia and Russians. Let's face they. You've got all these closest associates. The present. One after another pleading guilty. Often pleading guilty about their ties to Russian Russians. And. What are they covering up for and I had no idea what this all about seems to be a process crime. All I've seen this for process crimes. I've yet to see. Actually include with the Russians and we'll see I don't know homeowners who went. It's up to him to get there and see room. I'm not surprised. I think we are gonna see this whole sordid affair. Begin to unravel. We're gonna see the collusion with the Russians. Where there that goes directly to the president I'd do not know but it's clearly the people that were around him in the campaign. I think this is going to be a very sad chapter. After of American history. This is not not a good development something. Can seem that they lied to congress it's striking that a special counsel Muller's investigation has produced yet another guilty plea. And that that guilty plea is around lying to the FBI two committees to investigators. And my hunch is that we are nowhere near the end and either this investigation. Or of the individuals who will be caught up in having my two best. Michael Conn guilty plea. Clearly. Indicates a new and potentially deeply dangerous areas liability for the that always causes me concern of people. Indicated that lines and test them and personal. It's important people towed from us I. Think clearly the Mahler investigation is. Start and it really accelerate them he did what he should have done which is take a low profile and then two months for the election of the start to accelerate and.

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

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