The president's longtime bank reportedly provided detailed records to the Manhattan district attorney, who is probing Trump's business practices.
The personal banking executive bought a condo from a real estate company partly owned by Kushner.
Former White House ethics chief Walter Shaub called it the "absolute nightmare" he has warned against.
The Deutsche Bank case suddenly looks promising.
Trump's longtime bank said it has the tax records Congress is seeking, though court filings didn't disclose whether they're the president's tax returns.
A full percentage cut would reportedly save the president $3 million annually in interest payments.
The president apparently thinks he started his presidential campaign on Election Day.
Congressional Democrats are asking a federal judge to enforce their subpoena for Trump's taxes.
"No other bank would lend him money. We want to understand that relationship," the congresswoman tells Chris Hayes.
The president attacked The New York Times and "Fake Media" in a flurry of defensive tweets on Monday morning.