On Capitol Hill, Democrats armed with subpoena power say Weisselberg is one of their top targets for questioning as they launch an expansive investigation into Trump’s business. On Thursday, House Intelligence Committee Democrats said they would call Weisselberg for questioning, and members of the House Oversight panel have discussed doing the same.

“There seems to be overlap in a lot of the private matters with the president,” said Rep. Stephen Lynch (D-Mass.), who chairs a key House subcommittee on national security issues. “I think if there’s any one person who has a view of that and a perspective of that and a granular understanding of that, it will be Mr. Weisselberg.”

There are signs that The Trump Organization is prepared to fight back against inquiring Democrats. Earlier this week, a lawyer for the president’s company demanded that the Democrat-led House Judiciary Committee cease its investigation because it had been “irreparably” tainted by hiring a legal consultant whose firm has also long represented The Trump Organization.