Ain’t none of their damned business. But, I bet you an Abrams Tank or Nimitz Class Nuke Carrier that one of their cronies in the IRS has already provided them copies of every Income Tax document Trump has ever filed.
And every receipt, Form 99, and bank statement submitted with them or provided during an audit. If there was any dirt, it would be known by now, probably provided by some “whistleblower” that was a “former employee” who “quit because he couldn’t stand the corruption anymore”.