President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE may still cut off aid to Central American countries, acting White House chief of staff Mick Mulvaney Mick MulvaneyMick Mulvaney to start hedge fund Fauci says positive White House task force reports don't always match what he hears on the ground Bottom line MORE said Sunday.

Despite bipartisan criticism of the proposal, cutting off aid is “absolutely” still possible, Mulvaney said on “Fox News Sunday.”

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“This is his number one priority. Keep in mind, dealing with health care is nice, dealing with the economy is nice. The president’s first responsibility is to protect the integrity and safety of our nation, and we really do believe and I think again, most folks are starting to agree with us now, that the situation on the border is a national security crisis.” Mulvaney told Fox News’s Bill Hemmer.

Mick Mulvaney tells @billhemmer that more people are starting to realize there is a crisis at the border #FNS pic.twitter.com/rFQ9UNT7He — FoxNewsSunday (@FoxNewsSunday) April 7, 2019

Trump has called to end foreign aid to Guatemala, El Salvador and Honduras over the flow of migrants from the countries moving toward the U.S.

Critics, however, have said aid cuts are unlikely to achieve their desired effect.

“It may make the lives of these individuals even worse and thus encourage more of them to flee the countries that they are now leaving,” Sen. Susan Collins Susan Margaret CollinsSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-Maine), a member of the Senate Appropriations Committee, said last week. “So I’d actually like to see the president consider a different approach, an opposite approach.”

Trump last week backed down on his threats to close the southern border, saying he would give Mexico a "one-year warning" to stop the flow of drugs into the U.S.