In a court filing last week, Cohen said he had pursued a proposed Trump Organization real estate project in Moscow with Russian government officials well into the presidential campaign, with Trump's knowledge.
But according to memos penned by Comey, President Trump tried to protect Flynn by asking Comey to let the investigation into his false statements go.
Virginia Democratic senator Mark Warner said Trump's tweet was "serious", adding: "The President of the United States should not be using his platform to influence potential witnesses in a federal investigation involving his campaign".
Mr Flynn had been a fervent supporter of Mr Trump during the election campaign. As part of his plea agreement, Flynn agreed to cooperate with the Mueller investigation.
Mueller promised that he would drop a detailed report on Flynn's cooperation with the special counsel a year after Flynn pleading guilty to lying about his contact with Russian ambassador Sergey Kislyak. According to the addendum, Flynn has assisted with two other matters - at least one of them a criminal investigation - besides Mueller's Russian Federation probe, but those other matters are redacted. He will be sentenced in the U.S. District Court for the District of Columbia on December 18.
Flynn also admitted to making false statements about his work as an unregistered foreign agent to benefit the Turkish government.
Trump has long surrounded himself with liars, and for quite a while he's been using Twitter to praise the liars who impede the Mueller probe and castigate any former confidante who agrees to tell Mueller the truth about Trumpworld.
Mueller has wasted no time bringing into court other cooperating witnesses, such as George Papadopoulos, a former campaign adviser, and Paul Manafort, once Trump's campaign chairman, to face penalties for lying to his investigators or not fully cooperating.
Stone is suspected of pushing author Jerome Corsi to obtain Hillary Clinton's campaign team's hacked emails, published via WikiLeaks. It points to a conversation Flynn had with the Russian envoy, Sergey Kislyak, after then-President Obama had announced sanctions against Russia for its interference in the US elections. Flynn was in the White House for less than a month before he was sacked for lying to Vice President Mike Pence about his contacts with Russian officials.
Flynn ― who joined in chants of "lock her up" against Democratic presidential candidate Hillary Clinton during the 2016 Republican National Convention ― admitted that he made a false statement to the Federal Bureau of Investigation on January 24, 2017.
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