I think it’s obvious Steve Bannon is offering to cooperate with Bob Mueller:

Bannon has criticised Trump’s decision to fire Comey. In Wolff’s book, obtained by the Guardian ahead of publication from a bookseller in New England, he suggests White House hopes for a quick end to the Mueller investigation are gravely misplaced.

“You realise where this is going,” he is quoted as saying. “This is all about money laundering. Mueller chose [senior prosecutor Andrew] Weissmann first and he is a money-laundering guy. Their path to fucking Trump goes right through Paul Manafort, Don Jr and Jared Kushner … It’s as plain as a hair on your face.”

Last month it was reported that federal prosecutors had subpoenaed records from Deutsche Bank, the German financial institution that has lent hundreds of millions of dollars to the Kushner property empire. Bannon continues: “It goes through Deutsche Bank and all the Kushner shit. The Kushner shit is greasy. They’re going to go right through that. They’re going to roll those two guys up and say play me or trade me.”

Scorning apparent White House insouciance, Bannon reaches for a hurricane metaphor: “They’re sitting on a beach trying to stop a Category Five.”

He insists that he knows no Russians, will not be a witness, will not hire a lawyer and will not appear on national television answering questions.

There’s only way I know of (short of him killing himself) that he avoids those things. Look for a deal.