According to a game plan for Cohen's testimony reviewed by Fox News, the RNC is preparing a war room similar to what the party did when former FBI Director Jim Comey testified against the president on Capitol Hill past year.
"I know the Democrats are going to be lashing at him, I know the Republicans are going to say, why should we believe you today?"
Cohen spent Tuesday testifying before the Senate Intelligence Committee behind closed doors.
He also said it's unlikely the public will see any corroborating evidence and predicted Cohen's testimony would end up standing alone.
The congressional hearing would be the first time Cohen has accused the president of committing a crime while in office. Cohen later testified that Trump directed him to pay off the women.
Trump will not be in Washington while his former lawyer testifies, but will instead be in Vietnam for his summit with North Korean leader Kim Jong-un.
Cohen postponed previously scheduled testimony on Capitol Hill, citing concern about threats by Trump and his lawyer against Cohen and his family.
YouTube losing advertisers after video reveals recommendation 'wormhole' of pedophiles
YouTube is going to have to earn back the trust of its former advertisers, and users, who saw something grotesque on the platform. YouTube admits there is more it can do to catch abuse, and in a more timely manner.
The "have fun in prison" video, which features clips of Donald Trump's former "fixer" stumping for him on the campaign trail, is part of the media blitz the party has planned for Wednesday.
It will be the first of three much-awaited appearances on Capitol Hill this week - only one of them public - for Michael Cohen.
The decision, which renders Cohen no longer able to act as a lawyer, followed his felony conviction for lying under oath to Congress.
However, as a convicted perjurer, Cohen must convince numerous same lawmakers he lied to that he is telling the truth this time.
Cohen is scheduled to begin serving a three-year sentence on May 6 for crimes including campaign finance violations stemming from the hush money payments to Daniels and former Playboy model Karen McDougal. He is expected to be questioned by lawmakers about the Trump Tower project in Moscow during the 2016 election and other questionable foreign financial interests.
On Nov. 29, Cohen pleaded guilty to lying to Congress by telling lawmakers in 2017 that all efforts relating to the Moscow project had ceased by January 2016.
House Republicans in the last Congress investigated whether Trump's campaign co-ordinated with Russian Federation, but ended that probe over Democratic objections, saying that there was no evidence that they did so.
House Intelligence Committee Chairman Adam Schiff postponed Cohen's appearance before that committee saying it was "in the interests of the investigation", with no additional details.