President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE on Thursday blasted Rex Tillerson Rex Wayne TillersonGary Cohn: 'I haven't made up my mind' on vote for president in November Kushner says 'Alice in Wonderland' describes Trump presidency: Woodward book Conspicuous by their absence from the Republican Convention MORE after The Washington Post reported that the former secretary of State told lawmakers that Russian President Vladimir Putin Vladimir Vladimirovich PutinNavalny released from hospital after suspected poisoning Ex-Trump national security adviser says US leaders 'making it easy for Putin' to meddle The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting MORE was better prepared than Trump for a meeting in 2017.

"Rex Tillerson, a man who is 'dumb as a rock' and totally ill prepared and ill equipped to be Secretary of State, made up a story (he got fired) that I was out-prepared by Vladimir Putin at a meeting in Hamburg, Germany," Trump tweeted.

"I don’t think Putin would agree. Look how the U.S. is doing!"

Rex Tillerson, a man who is “dumb as a rock” and totally ill prepared and ill equipped to be Secretary of State, made up a story (he got fired) that I was out-prepared by Vladimir Putin at a meeting in Hamburg, Germany. I don’t think Putin would agree. Look how the U.S. is doing! — Donald J. Trump (@realDonaldTrump) May 23, 2019

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The president nominated Tillerson as secretary of State at the outset of his administration, and fired him in March 2018 amid numerous clashes over U.S. foreign policy.

The Post reported that Tillerson spent hours meeting with the House Foreign Affairs Committee on Tuesday, where he provided insight about the president's foreign policy strategy.

Tillerson told the panel that Putin out-prepared Trump during the meeting in Hamburg, and said he believed there was more the U.S. needed to do to confront Russia, according to the newspaper.

White House press secretary Sarah Huckabee Sarah Elizabeth SandersSarah Sanders on Trump's reported war dead criticism: 'Those comments didn't happen' Sarah Sanders memoir reportedly says Trump joked she should hook up with Kim Jong Un McEnany stamps her brand on White House press operation MORE Sanders appeared on CNN's "New Day" a short time after Trump tweeted about Tillerson, and defended the president's preparation for the meeting with Putin in Germany and its outcome.

She did not directly answer, however, when asked why Trump nominated someone he has since derided as "dumb as a rock" and "ill equipped" for the job.

Thursday's tweet marked the latest barb in the acrimonious relationship between Trump and his former top diplomat.

Tillerson reportedly called the president a "moron" while serving in the administration, straining their relationship. Trump at times undercut the then-secretary of State on talks with North Korea and other issues before firing him over Twitter.

In December, Tillerson criticized the president during a fundraising event in Houston, saying Trump was undisciplined and would suggest taking actions that would break the law. The two men "did not have a common value system," he said.

Trump hit back a short time later, calling Tillerson "dumb as a rock" and "lazy as hell."

Trump has repeatedly defended his posture toward Russia, simultaneously arguing that no administration has been tougher on the Kremlin and that it would be beneficial to get along with Moscow.

— This report was updated at 9:11 a.m.