Washington (CNN) Attorney General Jeff Sessions met with the Russian Ambassador to the US Sergey Kislyak to discuss Trump campaign matters during the 2016 presidential election, according to US intelligence intercepts, The Washington Post reports .

According to the Post, Kislyak told his superiors in Moscow about two conversations he had with Sessions, which included a discussion on policy issues important to the Kremlin. Sessions was a foreign policy adviser to President Donald Trump and major campaign supporter at the time.

Trump tweeted about the Post's story Saturday morning, saying the leaks of intelligence information, "like Comey's," must stop -- an apparent reference to fired FBI Director James Comey's testimony in June that he gave a memo about his interactions with Trump to a friend and Columbia Law School professor, the contents of which the friend, Daniel Richman, shared with The New York Times. Richman, a former federal prosecutor, has told CNN that the memo was not classified.

"A new INTELLIGENCE LEAK from the Amazon Washington Post, this time against A.G. Jeff Sessions," Trump wrote. "These illegal leaks, like Comey's, must stop!"

Sessions originally never disclosed any interactions he had with Kislyak, but a meeting first came to light in March when the Post reported that he met with Kislyak at an event during the Republican National Convention in Cleveland.

Sessions met with Kislyak for a second time during the presidential campaign, this time in his Senate office in Washington. This meeting, in September, also wasn't publicly known until the Post reported about it in March.

Sessions did not disclose either meeting when he applied for his security clearance. He also did not mention it when he was asked about contact with Russians during his Senate confirmation hearings earlier this year. Sessions denied any campaign-related meetings with Russians at the confirmation hearings, saying , "I did not have communications with the Russians."

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The revelations that he had met with Kislyak led to calls for Sessions to recuse himself from overseeing the FBI investigation into potential collusion between the Trump campaign and Russia. Sessions ultimately agreed to step aside from the investigation.

Justice Department spokeswoman Sarah Isgur Flores said in a statement to CNN that she could not comment on the Post's report on Friday.

"Obviously I cannot comment on the reliability of what anonymous sources describe in a wholly uncorroborated intelligence intercept that the Washington Post has not seen and that has not been provided to me," she said. "But the attorney general stands by his testimony from just last month before the Senate Intelligence Committee, when he specifically addressed this and said that he 'never met with or had any conversations with any Russians or any foreign officials concerning any type of interference with any campaign or election.'"

Trump tweets Saturday

In his series of tweets Saturday morning, the President also launched into criticism of the federal probe into Russian efforts to influence last year's election and allegations of collusion by his campaign, asking why federal investigators weren't looking into Hillary Clinton's handling of classified information in emails while secretary of state and accusing her of having ties to Russia.

Clinton spokesman Nick Merrill did not immediately respond to a request for comment Saturday.

Trump also referenced his pardoning power and defended his eldest son, Donald Trump Jr., over his posting emails on Twitter earlier this month showing him setting up a meeting last summer with a Russian lawyer, Trump's son-in-law Jared Kushner and then-campaign chairman Paul Manafort with the aim of getting information that would be damaging to Clinton's campaign.

While all agree the U. S. President has the complete power to pardon, why think of that when only crime so far is LEAKS against us.FAKE NEWS — Donald J. Trump (@realDonaldTrump) July 22, 2017

So many people are asking why isn't the A.G. or Special Council looking at the many Hillary Clinton or Comey crimes. 33,000 e-mails deleted? — Donald J. Trump (@realDonaldTrump) July 22, 2017

...What about all of the Clinton ties to Russia, including Podesta Company, Uranium deal, Russian Reset, big dollar speeches etc. — Donald J. Trump (@realDonaldTrump) July 22, 2017