Cohen had pleaded guilty in August to eight criminal counts, including campaign-finance violation and other charges and implicated the president in open court.
After the plea deal, Trump described Cohen as weak and a liar and said he himself did nothing wrong in relation to the Moscow project.
So, what to make of the president's tweet that he does not think that what Michael Cohen did was a crime?
The most recent development in the Mueller investigation came last week when former Trump lawyer Michael Cohen pled guilty to lying to authorities about his contact with Russian Federation and a Trump Tower construction project in Moscow.
Mr. Trump - who initially defended Cohen when federal investigators raided his apartment and office in April - has since appeared to turn on Cohen.
"Michael Cohen asks judge for no Prison Time", Trump tweeted.
"He lied for this outcome and should, in my opinion, serve a full and complete sentence", the president wrote.
Several lawyers said Trump's tweet amounted to witness tampering.
Solomon has deduced from these members of Congress that some of the contacts that occurred in 2016 were related to the "dossier".
Having just returned from a trip to Argentina for the G20 summit, Trump turned his attention to what he calls special counsel Robert Mueller's "witch hunt" into Russian interference in the 2016 election.
"Early in my reporting that unraveled the origins of the Trump-Russia collusion probe, tying it to Hillary Clinton's campaign and possible Foreign Intelligence Surveillance Act (FISA) abuses", Solomon wrote, "I started to see patterns just as in the old mob meetings: Federal Bureau of Investigation or intelligence-connected figures kept showing up in Trump Town USA during the 2016 campaign with a common calling card".
George Conway, husband of White House adviser Kellyanne Conway, soon suggested that Trump's tweet might be considered witness tampering.
There was a strong case against the president for witness tampering because of his prior acts and statements, like dangling the possibility of a pardon for his Manafort, legal experts said. "The truth is very bad for their mission!" "Nice to know that some people still have "guts!"," he added.