According to a report from Judicial Watch, four ISIS terrorists were apprehended this week at the Mexican border in a span of just 36 hours.

The report, which cites DHS sources, says the attempted crossings occurred in McAllen and Pharr, Texas.

In an interview with Greta Van Susteren earlier this week (video below), Rep. Duncan Hunter (R-Calif.) said at least 10 ISIS fighters have been caught crossing the Mexican border in Texas. Hunter said he received the information from U.S. Customs and Border Protection.

This morning, Rep. Michael McCaul (R-Texas), chairman of the House Homeland Security Committee, was asked about the latest Judicial Watch report by Steve Doocy.

McCaul said he has not been able to confirm the report, saying DHS officials he has spoken to claim it is not accurate.

But McCaul said the concerns about ISIS members trying to sneak over the Mexican border demonstrate the need for the federal government to finally implement a tough border security plan.

He said his "blueprint" calls for the deployment of new technology and aviation assets, including re-purposing equipment from the Afghanistan war after U.S. forces start to leave.

Watch McCaul's interview above and Hunter's appearance on "OTR" below.

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