A third person has been charged in the federal case involving classified material taken from the White House to former President Donald Trump's Florida estate, Mar-a-Lago. Carlos De Oliveira, a Mar-a-Lago maintenance worker, is accused of helping Trump's aide Walt Nauta move boxes of classified documents stashed at Mar-a-Lago, and then lying to federal investigators about it. The charges against De Oliveira, Trump, and Nauta could have serious implications, and former U.S. Attorney Joyce Vance believes that De Oliveira's charges could be the “final nail in the coffin” for Donald Trump if he flips.