Alan Dershowitz said on MSNBC Friday that Paul Manafort‘s plea deal with the special counsel should alarm the White House.

MSNBC’s Steve Kornacki asked the Harvard Law professor on Friday about the news that the former Trump campaign chairman is pleading guilty to the charges against him as part of a cooperation agreement with Robert Mueller.

“Is that something the White House be alarmed about right now?” Kornacki asked.

“Well of course they should be,” Dershowitz said, though he noted that Manafort is “not a credible witness” and might not be able to prove Trump’s guilt on an impeachable offense.

“There’s nothing he can testify to that would probably lend weight to impeachment because he didn’t have close contact with President Trump while he was president,” said Dershowitz. “What they are looking for is self-corroborating information that can be used against Trump… if they can make him sing and then there’s the possibility of him composing, elaborating on the story.”

Dershowitz argued there’s “no doubt” that Mueller’s interest in flipping Manafort is Trump.

“Once he agrees to cooperate, he has to cooperate about everything,” Dershowitz said. “There’s no such thing as partial cooperation.”

At the end of the segment, Dershowitz said that a pardon for Manafort is “off the table.” He concluded that the flip “opens up lots of doors that probably haven’t been opened before,” and is a “big win” for Mueller.

Watch above, via MSNBC.

[Image via screengrab]

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