Acting White House chief of staff Mick Mulvaney on Sunday said congressional Democrats will “never” succeed in obtaining President Donald Trump’s tax returns.

“Nor should they,” Mulvnaney told “Fox News Sunday.”

Trump is the first president in more than 40 years to refuse to release the tax documents to the public and Democratic lawmakers hope to change that.

On Wednesday, House Ways and Means Committee Chairman Richard Neal (D-Mass.) formally asked the Internal Revenue Service for six years of Trump’s personal and business tax information.

In his letter to the Treasury Department, which oversees the IRS, Neal cited a 1924 law that states the treasury secretary “shall furnish ... any return or return information specified” in a request from the head of the House or Senate tax-writing committees.

But Mulvaney said Sunday that he doesn’t believe the IRS will comply with Neal’s request.

″That is not going to happen and [Democrats] know it,” Mulvaney said. “They know the terms under law by which the IRS can give them the documents, but political hit job is not one of those reasons.”