Lawyers for two defendants in Donald Trump's classified documents case ought to consider whether their clients should cooperate with investigators after a key witness flipped, according to a legal expert. Former federal prosecutor Michael McAuliffe was reacting to confirmation that Mar-a-Lago IT worker Yuscil Taveras changed his under-oath testimony and provided evidence against Trump, his aide Walt Nauta, and Mar-a-Lago maintenance worker Carlos De Oliveira in order to avoid perjury charges. Taveras had previously testified to a special grand jury in March that he was not aware of any attempts by Trump, Nauta, or De Oliveira to delete security footage...