President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE claimed Thursday he did not fire former FBI Director James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE over the Russia investigation, despite his prior statements that the issue contributed to Comey’s firing.

"Not that it matters but I never fired James Comey because of Russia! The Corrupt Mainstream Media loves to keep pushing that narrative, but they know it is not true!" he tweeted.

Not that it matters but I never fired James Comey because of Russia! The Corrupt Mainstream Media loves to keep pushing that narrative, but they know it is not true! — Donald J. Trump (@realDonaldTrump) May 31, 2018

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Trump appeared to be referring to a New York Times report that Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE said the president initially asked him to reference Russia in his memo justifying Comey’s firing, which centered on the FBI chief’s handling of the probe into former Secretary of State Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE's use of a private email server.

The conversation was detailed in a separate memo authored by former Deputy FBI Director Andrew McCabe Andrew George McCabeGraham: Comey to testify about FBI's Russia probe, Mueller declined invitation Barr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' GOP votes to authorize subpoenas, depositions in Obama-era probe MORE, which was given to special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE.

Comey’s firing is a focal point of Mueller’s probe into whether Trump obstructed the investigation into ties between his campaign and Russia’s interference in the 2016 presidential election.

Trump and his allies have offered a series of changing explanations for his decision to fire Comey, which has complicated investigators’ effort to determine his intent.

Soon after the White House released Rosenstein’s memo, which criticized Comey’s handling of the Clinton investigation, Trump undercut it by telling NBC News that he was going to ax the FBI director “regardless of recommendation.”

“And in fact when I decided to just do it, I said to myself, I said 'You know, this Russia thing with Trump and Russia is a made-up story, it's an excuse by the Democrats for having lost an election that they should have won,’” the president said during a May 2017 interview with the network.

Trump later told a pair of top Russian diplomats that firing Comey had relieved “great pressure” on him over Russia, according to the Times.

The president has grown increasingly frustrated by the Mueller investigation as it moves closer to his inner circle.

Over the past 24 hours, Trump has repeatedly lashed out at Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE over his decision to recuse himself from the probe.

And the president has also continued to push his unsubstantiated claim that the Obama administration placed spies in his campaign in order to help Clinton in 2016.

“The corrupt Mainstream Media is working overtime not to mention the infiltration of people, Spies (Informants), into my campaign! Surveillance much?” he tweeted 10 minutes before his message about Comey.

The corrupt Mainstream Media is working overtime not to mention the infiltration of people, Spies (Informants), into my campaign! Surveillance much? — Donald J. Trump (@realDonaldTrump) May 31, 2018

Trump’s claims were rebutted this week by House Oversight and Government Reform Committee Chairman Trey Gowdy Harold (Trey) Watson GowdySunday shows preview: Election integrity dominates as Nov. 3 nears Tim Scott invokes Breonna Taylor, George Floyd in Trump convention speech Sunday shows preview: Republicans gear up for national convention, USPS debate continues in Washington MORE (R-S.C.), who met with senior Justice Department and intelligence officials following reports the FBI used a confidential informant in the Russia probe.

“I am even more convinced that the FBI did exactly what my fellow citizens would want them to do when they got the information they got and that it has nothing to do with Donald Trump,” Gowdy said Tuesday on Fox News.

The Russia probe has appeared to dominate Trump's attention, distracting from high-stakes negotiations with North Korea and on trade. The president vowed this week he would dedicate more of his time to those key policy issues instead of the investigation.

"Sorry, I’ve got to start focusing my energy on North Korea Nuclear, bad Trade Deals, VA Choice, the Economy, rebuilding the Military, and so much more, and not on the Rigged Russia Witch Hunt that should be investigating Clinton/Russia/FBI/Justice/Obama/Comey/Lynch etc.," he tweeted Tuesday.

--Updated at 8:49 a.m.