Donald Trump. Pic/AFP

US President Donald Trump on Tuesday sacked Secretary of State Rex Tillerson, ending his short but tumultuous tenure as the nations chief diplomat. CIA Director Mike Pompeo will take over the top position. Trump took to Twitter to share the development, saying: "Mike Pompeo, Director of the CIA, will become our new Secretary of State. He will do a fantastic job! Thank you to Rex Tillerson for his service!