A deadly confrontation at Mar-a-Lago over the weekend is the latest in a string of high-profile security incidents involving President Donald Trump, as former Secret Service officials warn that low-tech, lone actors now pose one of the toughest challenges to presidential protection."It should be quite clear to all of us by now that Trump is the most threatened president in the history of the U.S.," former Secret Service agent William "Bill" Gage told Fox News Digital Monday, pointing to multiple high-profile incidents in recent years. Unlike past presidencies, where threat levels often subside...

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