FBI to probe effort to impersonate top Trump adviser, sources tell CBSSusie Wiles, a close ally of US President Donald Trump, is the White House chief of staffThe FBI is investigating an effort by one or more unknown people to access the personal phone of Susie Wiles, the White House chief of staff, sources told the BBC's US news partner CBS. The key Trump ally told people that her phone had been hacked after an impersonator - or impersonators - used her contacts file to message other top US officials, sources told CBS. Some recipients of the messages raised suspicions after they were asked if they could continue a conversation in another platform, such as Telegram. "The White House takes the cybersecurity of all staff very seriously, and this matter continues to be investigated," a White House spokesperson said.