"Now, how many Iranian and Hezbollah terrorists are here already?" said King. "The highly-disciplined soldiers of Hezbollah are trained to lie low for years, or for decades. Those who have gone up against this enemy for our government estimate the number to be at a minimum--at a minimum--in the hundreds."

At the same hearing, the former chief of operations for the Drug Enforcement Administration testified that Mexican drug cartels are in "very close contact" with Hezbollah, Hamas and al Qaeda. He then pointed to what he called the possibility of a "nightmare scenario" in which Hezbollah and the Iranian al Quds force "focus on our Southwest border and use that as perhaps a springboard in attacking our country."

“When most people think of, you know, [the] drugs-terror nexus, they immediately think of Latin America,” Michael Braun, who retired from the DEA in 2008, told the committee on Wednesday.