Rex Tillerson, remember him?

Donald Trump certainly does. The only problem is that the US president apparently remembers his ex-secretary of state and the former ExxonMobil chief executive as being “dumb as a rock” and “lazy as hell”.

In a rare public appearance last Thursday in Houston, Texas native and industry stalwart Tillerson spoke frankly with CNBC correspondent Bob Schieffer about his time at the White House.

"So often, the president would say, ‘here's what I want to do and here's how I want to do it’, and I would have to say to him, ‘Mr President I understand what you want to do but you can't do it that way.