When former President Donald Trump disclosed that his Mar-a-Lago estate had been searched by the FBI Monday, the action prompted an immediate question: Of the multiple criminal investigations now pending, which one was the FBI pursuing? Sources familiar with the matter have since confirmed that the unprecedented law enforcement action was related to a continuing federal investigation into allegations that Trump removed classified documents from the White House when he left office. Yet the document probe is just one of a handful of federal and state inquiries that continue to press on the former president and some of his administration's closest allies. Scroll through to slides to learn more, and read the full story at the link in our bio.