Washington (CNN) A House Democrat grilled Treasury Secretary Steve Mnuchin Tuesday over Mnuchin's refusal to release President Donald Trump's tax returns to the House Ways and Means Committee.

During a Ways and Means Committee hearing, Rep. Bill Pascrell of New Jersey laid into Mnuchin for not handing over the tax documents to the committee, accusing the Treasury secretary of "staggering lies" in his reasons not to comply with Congress.

For months, the Ways and Means Committee has been locked in a battle with the Trump administration for the President's personal and business tax returns, which Trump, in breaking with presidential precedent , has refused to release.

"By refusing to turn over Donald Trump's business and personal tax returns to this committee, I think you're breaking the law," the New Jersey Democrat said.

"Your stated reasons for stonewalling our requests, you never cite any superseding legal basis. The only thing you suffer is smug rhetoric and staggering lies," he added later.