Treasury Secretary Steven Mnuchin said the stock market will probably see its gains wiped out if lawmakers fail to deliver planned tax cuts that will benefit corporate America.

“To the extent we get the tax deal done, the stock market will go up higher,” Mnuchin said in an interview on the Politico Money podcast released Wednesday. “But there is no question in my mind if we don’t get it done you are going to see a reversal of a significant amount of these gains.”

U.S. stocks have been hitting record highs, buoyed by strong economic data and, according to Mnuchin, investor optimism that the Trump administration’s planned tax cuts and regulatory relief will move forward. “I think it’s priced in, in anticipation, so I don’t think it’s priced in 100 percent certainty,” said Mnuchin. “So I think the market will go up.”

Mnuchin also gave his “absolute guarantee” that the tax bill will be on President Donald Trump’s desk by early December to be completed by the end of this year.

This article was provided by Bloomberg News.