U.S. Treasury Secretary Steven Mnuchin said on Thursday that he would shield President Donald Trump's tax returns from Congress, during remarks that could signal the administration's approach to an expected request from congressional Democrats.

During testimony in the House of Representatives, Mnuchin told the House tax committee that he would follow the law upon receiving a request for tax returns but would also protect Trump's privacy rights.

"I'm not aware if there's ever been a request for an elected official's tax return," Mnuchin said in response to questions from Democratic Rep. Lloyd Doggett, a member of the House Ways and Means Committee. "But we will follow the law and we will protect the president as we would protect any individual taxpayer under their rights."