According to the reports, Cohen will allege that Trump deliberately misstated his wealth on various occasions, exaggerating or downplaying it as he felt served his interests - for example, to avoid paying taxes.
Judge Andrew Napolitano said the timing of Michael Cohen's testimony before Congress appears to be meant to distract from President Trump's summit with North Korean leader Kim Jong Un.
Cohen will also say that Trump kept inquiring about the Trump Tower project in Moscow well into his presidential campaign, maintaining a personal interest in the venture despite running for the highest office in the land.
Cohen was sentenced to 36 months in prison in December for crimes including lying to Congress about Trump's business dealings with Russian Federation, and facilitating illegal payments.
In deference to the Mueller probe, the Democratic leadership of the House Oversight Committee has said it will not ask Cohen about Russia-related matters.
News said Cohen plans to "provide evidence of alleged criminal conduct by Trump since he became president", while the New York Times reported Cohen "will use documents and his personal experiences to support his statements".
With Trump in Vietnam for his latest summit with "Rocket Man", North Korean leader, Kim Jong-Un, there is sure to be a big push from the right to play up this summit as a way to detract from the impact of Cohen's testimony.
Cohen testified behind closed doors before the Senate Intelligence Committee on Tuesday, and he'll testify behind closed doors again on Thursday, before the House Intelligence Committee.
Matt Gartz threatened to reveal Michael Cohen secret girlfriends ahead of his testimony to Congress.
Cohen was one of Trump's closest aides and once said he would "take a bullet" for him but he turned against his former boss previous year and is cooperating with prosecutors after pleading guilty to tax evasion, bank fraud and campaign finance violations.
Cohen was convicted and sentenced on charges of tax fraud, lying to prosecutors and campaign finance violations for making hush money payments to two women just before Election Day to keep them quiet about their alleged affairs with the real estate mogul.
At his December sentencing Cohen, a former Trump loyalist, blamed his misdeeds on "a blind loyalty" to Mr Trump.
Critics noted that the tweet sounded a lot like Trump's own threats to Cohen, which many argued were clear instances of witness intimidation - a federal crime. On Tuesday, he goes behind closed doors for a talk with the Senate Intelligence Committee.
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