White House budget chief Mick Mulvaney said Tuesday that President Trump won’t sign a GOP tax plan if it raises taxes on the middle class.

Mulvaney said during an interview with Fox Business Network’s “Cavuto: Coast to Coast” that the White House will make the determination based on its own “numbers,” which he didn’t specify.

“If our numbers show … that taxes are going up on the middle class, we’re not going to sign it,” Mulvaney told host Neil Cavuto.

“Here at the White House, our principles remain the same,” he continued. “We want lower taxes on the middle class, we want it simpler and fairer on the middle class, and we want that low corporate tax rate.”

[RELATED: Rand Paul To Return To Capitol Hill Next Week]