In an unprecedented move, the Justice Department is intervening to take over President Trump's defense in a defamation lawsuit brought by writer E. Jean Carroll, who has accused him of rape. The president denies wrongdoing. Kim Wehle, a former assistant U.S. attorney and law professor at the University of Baltimore, spoke to CBSN's Tanya Rivero about the concerns raised by the government taking over the president's defense on a personal lawsuit.