President Donald Trump “is fighting for American citizens” by demanding full border wall funding ahead of a potential government shutdown — and “we are going to win” that fight, White House senior adviser Stephen Miller said Thursday night during an exclusive interview on Fox News’ “The Ingraham Angle.”

Senate Minority Leader Chuck Schumer (D-N.Y.) and House Minority Leader Nancy Pelosi (D-Calif.) met with Trump on Tuesday in the Oval Office — in a widely discussed and contentious meeting — to discuss whether or not they could reach a budget agreement before federal funding expires and a government shutdown commences.

Reporters and cameras captured the first 15 minutes of the raucous meeting, as Trump passionately demanded full border wall funding.

The Democratic leaders adamantly rejected that.

“If we don’t get what we want one way or the other … I will shut down the government,” Trump said. “I am proud to shut down the government for border security because the people of this country don’t want criminals with lots of problems and drugs pouring into the country.”

But thus far, Schumer and Pelosi are not budging.

Miller (pictured above left), who plays a key role in helping Trump craft immigration policies, told Fox News host Laura Ingraham that “this stand that we’re taking right now with the entire nation watching, and frankly the whole world watching, is a stand that we think we’re going to win.”

“The Democrats are fighting for illegal aliens. Donald Trump is fighting for American citizens. That’s what this whole thing’s about,” Miller said. “This is about sovereignty. It’s about working men and women. It’s about safe communities. It’s about wages, living conditions, quality of life.”

“This is the battle right now right before our very eyes. We are going to win because Donald Trump is not backing down,” Miller also declared.

Trump’s senior adviser also said that “there is no question” that both political parties in America “have contributed to unwise foreign policy, unwise trade policy and unwise immigration policy.”

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“Donald Trump came into office and has turned that all around, getting tough on China on trade, renegotiating NAFTA, cracking down on illegal immigration, dealing with unskilled low-wage migration, [and] reorienting our foreign policy,” Miller said. “All these issues, Laura, that have effected working people in our country for decades, he’s turning around.”

“But the Democratic Party of today … is an open borders party,” Miller said.

Miller also called out Schumer for supporting border barrier legislation in 2006.

“And now that his Democrat Party has become the party of open borders and Donald Trump is president, he’s against it,” Miller said.

Related: Pelosi, Schumer ‘Used to’ Care About ‘Poorest Citizens’ Before Prioritizing Illegal Immigrants

When Ingraham asked Miller about Schumer’s mockery of Trump’s campaign promise to force Mexico to pay for the wall, Miller replied, “If Chuck Schumer wants to pass legislation saying that we can pass all of our trade savings on border security, that would be great.”

“In the meantime, the savings from the trade deal will offset the cost of the wall,” Miller said. “And more importantly than all of that, the wall is going to save American lives. It’s going to save American jobs and it’s going to save in the long term hundreds of billions of dollars.”

Trump’s fight to build the wall, secure U.S. borders and enforce immigration laws “is going to be one of the defining issues of the nest two years heading into 2020,” Miller predicted.

“Donald Trump is fighting for working people and he’s fighting to restore the borders around this country that are the essential ingredient for national sovereignty and national success in a way that nobody has who’s held that office — not only in my lifetime, but frankly in the history of this country,” Miller said.

Ingraham also asked Miller about the seven-year-old Guatemalan girl who died after a few hours in U.S. Customs and Border Patrol (CBP) custody after facing days of dehydration and exhaustion.

“If you want to stop the horrors on the northward trek — the rape that occurs, the abuse that occurs, the physical assault and the death that occurs — then for the love of God, fund the border wall,” Miller said forcefully.