Two key Senate Democrats have launched an inquiry after a ProPublica investigation revealed this week that a White House official had intervened on behalf of his former legal clients - pro-Trump influencer Andrew Tate and his brother - during a federal investigation.On Thursday, Sens. Richard Blumenthal and Gary Peters sent letters to the White House and the Department of Homeland Security asking for a full accounting of the official's activities, calling his actions a brazen interference with a federal investigation."