Former Nixon aide John Dean asserted over the weekend that former Trump campaign aide Rick Gates could bring down Donald Trump’s entire presidency.

In a tweet on Saturday, Dean explained why Gates’ testimony against former Trump campaign manager Paul Manafort also puts the president in peril.

“Mueller is throwing everything he can against Manafort, including Gates who can nail him,” Dean wrote. “Increasingly it appears Manafort is the link to Russian collusion.”

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“If Gates can testify that Manafort was acting with Trump’s blessings, it’s the end of his presidency,” he added. “That’s substantial.”