Myrick: Is Hezbollah in Mexico?

Sue Myrick, who represents the Mint Hill area in the U.S. House of Representatives, released this video today bemoaning the U.S. Homeland Security for not taking seriously the threat of Hezbollah entering the country illegally along the Mexico border. The narrator of the video cites anecdotal evidence, while the Director of Homeland Security, Janet Napolitano, says there is no credible threat. Hezbollah has attacked American interests around the world, but has never directly threatened inside our own borders. Is Myrick correct that more attention should be paid to terrorism on the Mexican border?