WASHINGTON (AFP) - Former US secretary of kingdom Rex Tillerson said Donald Trump turned into "undisciplined" and again and again wanted to interrupt the regulation -- leading the united states president to reply Friday that his onetime cabinet member become "dumb as a rock."

Tillerson, who became fired in March, made no try and deny his poor relationship with Trump in the course of a unprecedented interview Thursday night time as a part of a charity dinner in his native Texas.

"I assume part of it changed into manifestly we're starkly different in our patterns. We did not have a common fee device," Tillerson advised veteran journalist Bob Schieffer of CBS news, which broadcast an excerpt of the interview.

"I d have to mention to him,  properly, Mr President, I apprehend what you want to do, but you may t do it that manner -- it violates the law, it violates a treaty. "

"He got actually frustrated," he stated. "I assume he grew uninterested in me being the man each day that informed him you may t do this and allow s communicate approximately what we will do."

Trump voiced anger hours later in a harsh tweet, announcing that Tillerson "didn t have the mental capability needed" to be the top US diplomat.

"He turned into dumb as a rock and that i couldn t take away him rapid sufficient. He became lazy as hell. Now it's far a whole new ballgame, high-quality spirit at nation!" Trump wrote from Air force One as he back from a conference in Kansas city about crime.

Trump praised Tillerson s successor, the brusque former congressman and CIA leader Mike Pompeo, for "doing a awesome activity."

He will become the latest cupboard member on which Trump has became his knives. He again and again denounced legal professional trendy Jeff session, who was ousted final month, as "very vulnerable" for not blocking a probe into whether or not the Trump presidential campaign colluded with Russia.

Tillerson, a former chief executive of oil large ExxonMobil, had no authorities enjoy and had by no means met Trump while his nomination was promoted through Republican birthday celebration insiders, who hoped for a strong discern who could despite the fact that attraction to the wealthy person-turned-president along with his outsider fame and business heritage.

however Tillerson immediately struggled to in shape in, focusing on inner state department streamlining in preference to broader foreign policy goals and fending off the click as his rapport frayed with Trump.

"It become tough for me coming from the disciplined, tremendously technique-orientated ExxonMobil Corp to go to paintings for a person who's quite undisciplined, doesn t like to read, doesn t study briefing reports, doesn t want to get into the info of lots of factors," Tillerson stated at the event in Houston.

Trump is proudly anti-intellectual, pronouncing that he succeeds by way of following his instincts and knows better than experts.

asked about his studying habits in an interview rapidly after taking workplace, Trump stated he turned into "looking at a book" however turned into distracted via smartphone calls every time he tried to get began.

while he decided on him, Trump offered a hugely extraordinary evaluation of Tillerson than on Friday, pronouncing his "tenacity, large revel in and deep information of geopolitics" made him an "great preference."

but it quick have become clear that the two had little chemistry. Simply as Tillerson changed into travelling Asia remaining 12 months and talking of strains of verbal exchange with North Korea, Trump tweeted that he become "wasting his time."

Pompeo has faced no such backlash from Trump and has traveled four times to Pyongyang.

Trump also used Twitter to announce Tillerson s firing and, in a final indignity, the White house made it recognized that the state s top diplomat was on the bathroom whilst he learned the news.