MSNBC national security reporter Ken Dilanian said on Monday that President Donald Trump’s former fixer, Michael Cohen, would be bringing documentation to back up his testimony to Congress this week, and predicted “explosive” revelations.

Host Ali Velshi detailed the wide variety of questions Cohen will have to explain, including everything from campaign debts, Trump’s business practices, conflicts of interest, fraudulent activities, campaign finance laws, witness intimidation attempts, and his own reputation as “a well-established liar.”

“That’s his challenge as a witness,” said Dilanian. “In the closed door hearings, he’s going to have to clear up the lies that’s he told to the House and Senate Intelligence Committee about the timing of that Trump Tower Moscow deal and answer other Russia questions they have.” He added that the sparks would really fly at the public hearing, which he predicted would “go in some very unpredictable directions.”

“That list of topics you read is so incredibly broad, and I am told that Michael Cohen has been preparing for a long time for this hearing,” Dilanian said. “Because his credibility will be challenged, he’s going to bring documents and he’s going to tell stories about how Donald Trump behaved behind the scenes that will not be flattering.”

“I think it has the potential to be explosive, given that it’s going to be live on television,” he added. “Cohen is an insider who’s been with Trump since 2006 and knows a lot of secrets.”

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