President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE said in an interview published early Wednesday that he would “totally be willing” to shut part of the government down if Congress does not approve a $5 billion budget to build his proposed wall along the U.S. southern border.

Trump also told Politico that the issue is a “total winner,” politically.

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"I don't do anything ... just for political gain," Trump said. "But I will tell you, politically speaking, that issue is a total winner. People look at the border, they look at the rush to the police, they look at the rock throwers and really hurting three people, three very brave Border Patrol folks — I think that it's a tremendous issue, but much more importantly, is really needed. So we have to have border security."

Politico noted that Trump was appearing to refer to a confrontation along the U.S.-Mexico border on Sunday in which migrants threw rocks at Border Patrol agents, adding that his claim that they were seriously injured is unsubstantiated.

Democrats have pledged $1.6 billion for border security just weeks before they regain control in the House and days before lawmakers must pass government funding legislation.

A partial shutdown would bring some operations at the Homeland Security, Justice and State departments, among other government agencies, to a halt.

“I am firm,” Trump told Politico, threatening to veto a spending bill that does not include funding for the wall, which was a signature campaign issue.

Shutting down the government could cost Trump politically, despite his claims.

A Morning Consult poll on Monday found that 55 percent of registered voters opposed shutting the government down over funding for the wall, while only 31 percent supported it.

Just less than half of Republicans supported a shutdown for the wall, while 34 percent opposed it.