The US President Donald Trump on Twitter called the former Secretary of state Rex Tillerson stupid and lazy.

“[Secretary] Mike Pompeo is doing a great job, I’m very proud of him. His predecessor, Rex Tillerson did not have the necessary mental abilities. He was stupid, and I couldn’t get rid of him fast enough. He was lazy as hell,” trump wrote.

The US President spoke after Tillerson in a public speech called him” a rather disorganized man who does not like to read reports and delve into the details, ” writes BBC News.

Rex Tillerson, who led the oil company ExxonMobil, headed the US state Department at the invitation of Donald Trump. Trump spoke positively about him, calling “more than a businessman” and “a world-class player.” Later rumors of their conflict surfaced; in March 2018, the President fired Tillerson.