U.S. Border Patrol agents reportedly arrested an Afghan national on the FBI’s terrorism watchlist who illegally entered America by crossing its southern border with a group of migrants last week.

The individual, who was not identified, made it across the U.S.-Mexico divide near Otay Mesa, California, on Wednesday, Fox News national correspondent Bill Melugin tweeted on Sunday.

The reporter, who cited “multiple” U.S. Customs and Border Protection (CBP) sources, said he was told the FBI “confirmed the match” and the bureau is leading an investigation.

BREAKING: Per multiple CBP sources, Border Patrol agents in San Diego sector arrested an Afghan national on the FBI’s terror watchlist after he crossed illegally w/ group of migrants near Otay Mesa, CA on Wednesday. I’m told FBI confirmed the match, & is leading investigation.

— Bill Melugin (@BillFOXLA) May 14, 2023

The Daily Wire has reached out to CBP as well as the FBI seeking comment.

News of the arrest generated a great deal of reactions on social media.

“And remember: got aways have never been higher. Vast stretches of border totally unguarded and unpatrolled as agents forced to process and release record influx,” said Stephen Miller, who served as a top aide to former President Donald Trump.

The reported arrest took place as the Biden administration made preparations for an expected influx of people at the border with the pandemic-era Title 42, which allowed authorities to quickly turn away migrants at the border on public health grounds, expiring at the end of Thursday. Multiple cities and at least one state declared emergencies as officials braced for a surge in migrants, many seeking entry through legal pathways.

Still, Republicans have assailed President Joe Biden for instituting “open border policies” that they say have fueled problems, such as fentanyl drug trafficking and illegal immigration. Some Democrats have also condemned the administration for its response to the border situation.

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Homeland Security Secretary Alejandro Mayorkas on Sunday rejected the criticism. “It’s extraordinary what we’ve done over the past 18 months or so,” Mayorkas said during an appearance on CNN’s “State of the Union.” In addition, the secretary said Border Patrol encounters have dropped by half in the two days since Title 42 ended.

Melugin said Rep. Darrell Issa (R-CA), who represents a district along California’s southern border, confirmed the Afghan national arrest with a CBP contact.

“Biden’s open borders aren’t just a gateway to five million illegals, record human and child trafficking and the deadliest drug crisis in our history,” Issa said in a statement. “Biden’s reckless policy is also an open invitation to even the most wanted terrorists in the world to come to America.”

House Oversight Committee Chairman James Comer (R-KY) said he’s lost track of the informant who was the source for the investigation into alleged corruption centered around President Joe Biden and his family.

The informant is the source for a whistleblower who informed Comer about an alleged bribery scheme.

Appearing on “Sunday Morning Futures” on Fox News, Comer said at least nine of the ten whistleblowers with knowledge of the situation are “either currently in court, they’re currently in jail, or they’re currently missing.”

“Well unfortunately, we can’t track down the informant,” Comer told host Maria Bartiromo. “We’re hopeful that the informant is still there. The whistleblower knows the informant, the whistleblower is very credible.”

“Hold on a second, Congressman,” Bartiromo interjected. “Did you just say that the informant is now missing?”

“Well we’re hopeful that we can find the informant,” Comer repeated. “Now remember, these informants are kind of in the spy business, so they don’t make a habit of being seen a lot or being high-profile or anything like that. We have basic information with respect to what the informant has alleged, and it’s very serious.”

“Are there whistleblowers or informants missing right now?” asked Bartiromo.

“Well, with what we’ve investigated, and the people that we’ve tracked down, going back to the (CEFC China Energy), the two main players in that business, as well as all the Americans that were involved in the different Biden influence peddling schemes, as well as the Serbian national, nine of the ten people that we’ve identified that have knowledge with respect to the Biden’s, they’re one of three things, Maria. They’re either currently in court, they’re currently in jail, or they’re currently missing.”

.@JamesComer tells @MariaBartiromo 9 out of 10 people that knows about Biden’s corrupt business deals is either in court, in jail, or missing. pic.twitter.com/xaqIqMYgqd

— The Dirty Truth (Josh) (@AKA_RealDirty) May 14, 2023

“So it’s of the utmost importance that the FBI work with us to be able to try to identify what investigations they’ve done, because we have people that want to come forward, but honestly Maria, they fear for their lives. Not only are the Biden lawyers and the Biden White House intimidating them, the media is trying to intimidate and discredit them.”

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“Who in the White House is intimidating them, do you know?” asked Bartiromo.

“I do know. We’re saving that for a later time,” said Comer.