Secretary of State Rex Tillerson's tenure has come to an end, as, on Tuesday morning, President Donald Trump shocked the world by saying that he replaced his chief diplomat with CIA Director Mike Pompeo.The decision to swap Tillerson for Pompeo was made by Trump on Friday, according to The Washington Post. Tillerson ended his trip to Africa early on Monday so that he could return to Washington as a result of Trump's decision. The move was reportedly timed so that it would cause minimal disruption to the president's planned diplomatic talks with North Korea and trade negotiations.The move does bring about at least one milestone: CIA Deputy Director Gina Hapsel, who is set to replace Pompeo as head of the agency, will be the first woman to serve as director of the CIA.Although Tillerson appeared to have known that he was going to be fired before he publicly declared that the poisoning of an ex-Russian spy and his daughter "clearly" came from Russia, the timing of Tillerson's firing is nevertheless likely to raise eyebrows. Trump had long feuded with Tillerson over the perception that the latter was "too establishment" in his thinking, despite the fact that Tillerson was the first secretary of state ever appointed to have no prior foreign policy experience. Tillerson had also on occasion taken a tougher stand toward Russia than Trump, with the secretary of state even warning that America is still vulnerable to potential Russian electoral meddling back in February.