As President Trump is contemplating potential U.S. strikes on Iranian nuclear facilities, law enforcement officials have stepped up surveillance of Iran-backed operatives in the United States, multiple sources told CBS News.

FBI Director Kash Patel has increased efforts to monitor possible domestic sleeper cells linked to Hezbollah — a U.S.-designated foreign terrorist organization backed by Iran — since Israel's Operation Rising Lion offensive began earlier this month, U.S. officials said.

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The threat from Iranian operatives has worried current and former administration officials since Iranian General Qasem Soleimani was assassinated on Mr. Trump's orders in January 2020.

Late last year, federal prosecutors charged an operative of Iran's Islamic Revolutionary Guard Corps and two U.S.-based people with plotting to surveil and assassinate critics of the Iranian regime. The IRGC operative allegedly told investigators he was pushed by unnamed IRGC officials to plan an attack against Mr. Trump.

Ryan asked Adams: "I just want to clarify. You are 100% certain that there are 1,000 plus Al-Qaeda-trained fighters within the U.S. borders?"

Adams, currently a global threat advisor with extensive experience in Middle Eastern affairs, responded: "Well, Al-Qaeda says they trained and deployed a thousand for this attack. First off, I think there are more than a thousand Al-Qaeda members in the United States, but for the Homeland Attack, that number is based on what Al-Qaeda is saying, so they could exaggerate it; however, they did have about 1,400 in the Hamas Attack so the number is not off from what they did in the first round of attacks."

Frightening information to hear. Former CIA targeting officer Sarah Adams is warning of an IRGC U.S. Homeland attack in retaliation for Soleimani. She says 1,000 or more terrorists may already be here and discusses the “Invisible Bomb” undetectable to magnetometers and now… pic.twitter.com/tVGLhHGqZI

— Johnny St.Pete (@JohnMcCloy) December 28, 2024

Frightening information to hear. Former CIA targeting officer Sarah Adams is warning of an IRGC U.S. Homeland attack in retaliation for Soleimani. She says 1,000 or more terrorists may already be here and discusses the “Invisible Bomb” undetectable to magnetometers and now… pic.twitter.com/tVGLhHGqZI

— Johnny St.Pete (@JohnMcCloy) December 28, 2024