FBI probes effort to impersonate White House chief of staff Susie Wiles, sources say

One or more unknown people accessed White House chief of staff Susie Wiles' personal cellphone and used her contacts file to reach out to other top officials and impersonate her, sources told CBS News Thursday.

Some of the recipients realized the messages were suspicious because the texts and calls came from an unknown number, sources said, and the impersonator or impersonators asked if the conversations could be continued in another platform, such as Telegram.

The suspicious messages hit in-boxes over an unknown period of time, sources said.