President Donald Trump said someone hacked his chief of staff’s phone, just weeks after the FBI warned of “malicious actors” impersonating senior officials.

The U.S. government is investigating after elected officials, business executives and other prominent figures received messages in recent weeks from someone impersonating Susie Wiles, President Donald Trump’s chief of staff.

The FBI is investigating mysterious texts and calls from someone who has claimed to be White House Chief of Staff Susie Wiles, sources familiar with the matter said.