Was the Secret Service behind this? On Monday, President Trump visited the El Arepazo restaurant to support the Venezuelan community in Doral, Florida. As the 47th President walked in, he was greeted by a crowd of around 100 people; however, as he walked into the restaurant, something interesting happened. Just seconds after Trump entered the restaurant, the TVs started to flicker and eventually turned off. Take a look at the moment here: President Trump visits El Arepazo restaurant in Doral, FL  pic.twitter.com/d3MWmrL0Il — Margo Martin (@MargoMartin47) March 9, 2026 If you have ever been to a Trump rally in a closed location, you know there’s a good chance your signal will be jammed. Why is that? Politico explained that U.S. Presidents have their own vehicle, nicknamed Lineback, that jams signals at locations where the President is present: We know that some of the technology is already in use. Commercial radio frequency barrage jammers are now standard in many VIP motorcades around the word. In the United States, every presidential and vice presidential motorcade includes an electronic countermeasures Suburban, codenamed Lineback, which features a U.S. Navy-developed electronic warfare package that creates a radio frequency bubble around the president’s limousine. It shields the motorcade from he threat of a hidden remotely triggered improvised explosive device. Because remotely-triggered IEDs can also be rigged to explode when their radio frequency circuit is terminated, current jammers can intercept and interrupt the frequencies long enough to keep the path between the trigger device and the bomb closed. These devices have been tested. In 2005, a British-provided barrage jammer saved the life of the President of Pakistan, Pervez Musharraf, when it hijacked a remotely triggered bomb and allowed it to detonate only after his motorcade had passed. And yet it is something of an arms race. The more sophisticated these IEDs have become, the more money the government has thrown into jamming technology. Tiny but powerful bombs can now be triggered by flashes of light and heat; ground-based jammers are now equipped with infrared countermeasures (IRCMs) that can disrupt those signals. (The President’s fleet of Nighthawk helicopters recently upgraded its own IRCMs). In the two big wars in Afghanistan and Iraq, advances in countermeasures have saved hundreds of lives we know about and probably thousands more. Generally, the jammers got bigger, along with amount of radio spectrum they were able to block – a scorched electronic earth strategy. For warzones, this works well. For American cities, jammers have to be much more selective. .