EXCLUSIVE: A deep-pocketed outside political committee that supports former President Trump’s White House campaign is taking aim at Vice President Kamala Harris over the issue of border security.

“America needs a commander-in-chief who’s tough on illegal immigration. Kamala Harris fails that test,” National Border Patrol Council vice president Art Del Cueto charges in a new ad from the Preserve America super PAC.

The spot, shared first with Fox News Digital on Friday, is the latest by either the Trump campaign or aligned super PACs that target Harris for being weak on border security, which many Republicans see as the vice president’s political Achilles’ heel.

Trump and his allies have repeatedly criticized Harris for nearly two weeks — since she replaced President Biden at the top of the Democrats’ national ticket — over the surge of migrants across the nation’s southern border during the Biden administration.

Harris was tasked by Biden in 2021 with leading the diplomatic outreach to tackle the “root causes” of migration in Central American countries. It led to her being dubbed the “border czar” both by the media and Republican opponents, although the White House has rejected that description.

Del Cueto — who has endorsed the former president and who joined Trump running mate Sen. J.D. Vance at a campaign event Thursday along the U.S.-Mexico border in Arizona — calls Harris “Biden’s border czar” in the ad, which was filmed along the southern border.