WASHINGTON (AP) — Former President Donald Trump said in a lengthy statement Monday that the FBI was conducting a search of his Mar-a-Lago estate and asserted that agents had broken open a safe. A person familiar with the matter said the action was related to a probe of whether Trump had taken classified records from his White House tenure to his Florida residence.

The action, which the FBI and Justice Department did not immediately confirm, marks a dramatic escalation in law enforcement scrutiny of Trump and comes as he has been laying the groundwork to make another bid for president. Though a...