REUTERS

Rex Tillerson has a growing list of differences with the White House, including a new debate over Iran policy and personnel. His frustration is hardly a secret and it has spilled out publicly at times. "But friends sense a change of late," CNN wrote.

For weeks, conversations with Tillerson friends outside of Washington have left the impression that he, despite his frustrations, was determined to stay on the job at least through the end of the year. That would allow time to continue efforts to reorganize the State Department and would mean he could claim to have put in a year as America's top diplomat.

Read alsoU.S. 'may send arms' to Ukraine, says new envoy - BBCBut two sources who spoke to CNN on condition of anonymity over the weekend said they would not be surprised if there was a "Rexit" from Foggy Bottom sooner than that.

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Both of these sources are familiar with Tillerson conversations with friends outside Washington. Both said there was a noticeable increase in the secretary's frustration and his doubts that the tug-of-war with the White House would subside anytime soon. They also acknowledged it could have been venting after a tough week, a suggestion several DC-based sources made when asked if they saw evidence Tillerson was looking for an exit strategy.