"Fox News Sunday" host Chris Wallace and Steven Mnuchin Steven Terner MnuchinShutdown clash looms after Democrats unveil spending bill Lawmakers fear voter backlash over failure to reach COVID-19 relief deal United Airlines, unions call for six-month extension of government aid MORE sparred on Sunday over the Treasury secretary's suggestion that Congress give President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE a line-item veto in future spending bills to avoid concessions to Democrats.

“I think they should give the president a line-item veto. These things should be looked at,” Mnuchin said.

“But that’s been ruled unconstitutional by the Supreme Court, sir,” Wallace responded.

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“Well, again, Congress could pass a rule, OK, that allows them to do it,” Mnuchin said.

Wallace said that doing so would involve passing a constitutional amendment.

“Chris, we don’t need to get into a debate in terms of — there’s different ways of doing this,” Mnuchin responded.

“My comment is, it’s clear what happened. The Democrats, in order to get us military spending, demanded a massive increase in nonmilitary spending. And the president made the decision this time that that was worth it.”

Mnuchin's comments echo those of the president on Friday after he signed a $1.3 trillion omnibus spending bill, averting a government shutdown just hours after he threatened a veto of the legislation.

“I say to Congress, I will never sign another bill like this again,” Trump said. “I'm not going to do it again. Nobody read it. It’s only hours old. Some people don't even know what’s in it.”

The president called on Congress to give him the power to make line-item vetoes on all government spending bills, and called on the Senate to end its filibuster rule to make it easier to implement the Republican agenda.