Secretary of State Rex Tillerson is expressing growing frustration with the Trump administration and may be considering resigning from his role, according to a report from CNN Monday morning.

Though the former CEO of ExxonMobil Corp. has said that he would stay on as the top U.S. diplomat until the end of the year at least, several anonymous sources told CNN over the weekend that he might leave earlier than that.

Sources "familiar with Tillerson conversations with friends outside Washington" admit the secretary of State may just be venting, but they sense his doubts about President Trump are growing.

Tillerson reportedly agreed with Trump critics who thought it was unprofessional when the president lashed out last week at Attorney General Jeff Sessions because he recused himself from the investigation into Russian meddling in the 2016 presidential election.

Trump referred to Sessions as "beleaguered" in a Monday morning tweet and has reportedly floated the idea of replacing him with former New York City Mayor Rudy Giuliani (R).

"Rexit," as CNN's sources referred to it, would mark another change in an administration currently in the middle of a shakeup. On Friday, press secretary Sean Spicer announced he would resign, immediately after Wall Street financier Anthony Scaramucci was named White House communications director.