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 early Friday said 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 "can't define what a leak is" and doubled down on his accusations that Comey illegally leaked classified information by sharing memos.

"Is everybody believing what is going on. James Comey can’t define what a leak is. He illegally leaked CLASSIFIED INFORMATION but doesn’t understand what he did or how serious it is. He lied all over the place to cover it up. He’s either very sick or very dumb. Remember sailor!" Trump tweeted.

Is everybody believing what is going on. James Comey can’t define what a leak is. He illegally leaked CLASSIFIED INFORMATION but doesn’t understand what he did or how serious it is. He lied all over the place to cover it up. He’s either very sick or very dumb. Remember sailor! — Donald J. Trump (@realDonaldTrump) April 27, 2018

Trump's tweet comes after two heated exchanges between Comey and news anchors this week, the first during a CNN town hall with Anderson Cooper and the second during an interview with Fox News's Bret Baier.

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During the interviews, Comey contested Trump's assertion that releasing a memo detailing his conversations with the president constituted a leak.

"He's just wrong. Facts really do matter," Comey responded in his interview with Baier. "Which is why I'm on your show, to answer your questions. That memo was unclassified then, it's still unclassified."

Trump has branded Comey a “liar” and “leaker," claiming the ex-FBI director shared classified information. Since the start of Comey’s recent media blitz promoting his new book, Trump claimed Comey's leaks led to the appointment of special counsel Robert Mueller, suggesting the entire process was illegitimate.

Trump's mention of a "sailor" in his tweet appears to be a reference to Kristian Saucier, whom Trump has previously tweeted about and pardoned earlier this year.

Saucier was a machinist's mate on the USS Alexandria, a nuclear attack submarine, from 2007 to 2012. He was later charged in 2015 with taking photos of classified spaces on the submarine. He spent a year in jail and was given an "other than honorable" discharge from the Navy.