Mr. Mnuchin and Mr. Rettig testified Wednesday at a hearing of the Senate subcommittee overseeing the Treasury and Internal Revenue Service budgets.
“This is why there are three branches of government,” Mr. Mnuchin said. “This will go to the third branch of government to be resolved.”
Rep. Richard Neal (D., Mass.), chairman of the House Ways and Means Committee, has requested six years — 2013 through 2018 — of Mr. Trump’s business and personal tax returns along with audit records. Mr. Neal invoked a 1924 statute that lets the chairmen of the tax-writing committees obtain any taxpayer’s returns.