President Trump's first national security advisor, Michael T. Flynn, texted a former business associate on Inauguration Day that Obama-era sanctions against Russia would be "ripped up" and that a lucrative proposal to build nuclear reactors with Russian partners in the Middle East was "good to go", a witness has told Congress.
Representative Elijah Cummings, the senior Democrat on the House Oversight Committee, said a whistleblower had contacted his office with evidence that Flynn was pushing to remove sanctions on Russian Federation in order to spur the ambitious nuclear plan ahead.
Flynn attempted to "manipulate the course of global nuclear policy for the financial gain of his business partners", and assured a business partner the U.S. would relax sanctions once he worked in Trump's White House, Cummings wrote to House Oversight Chairman Trey Gowdy, R-South Carolina.
Cummings, in a letter to Trey Gowdy, the Republican chairman of the Oversight Committee, detailed the whistleblower's allegations and called on the committee to subpoena Flynn to testify.
"I believe the American people want Congress to hold President Trump and his administration accountable", Cummings wrote, "and they are exhausted of Republicans in Congress putting their heads in the sand when faced with credible allegations of grave abuses".
The letter says Flynn blamed Obama for having 'f***** everything up in my nuclear deal with the sanctions'.
Flynn had texted Copson with the same message - that the nuclear reaction project was "good to go" - from his place on the dais outside the Capitol 10 minutes into Trump's inaugural address, the whistleblower told Cummings.
Cummings wrote that Mueller's office had asked him to hold back the information until "they completed certain investigative steps" - which apparently have now been concluded.
Neither Copson nor an attorney for ACU responded to a request for comment.
According to the whistleblower, Copson said, "Mike has been putting everything in place for us".
Cummings said that the whistleblower's allegations raise concerns that Flynn improperly aided the nuclear project after joining the White House as one of Trump's top security officials.
"This is going to make a lot of very wealthy people", the associate, Alex Copson, told the whistleblower on inauguration day, according to the whistleblower's account to the Democrats.
Cummings added: "They have now informed us that they have done so".
Gowdy has not responded to requests from ABC News for comment. He said Flynn did not cash the check, however.
The whistleblower is not named in the five-page letter that Cummings shared with ABC News on Wednesday, and is unlikely to identify him or herself, fearing retaliation. Once Flynn started at the White House, federal regulations prohibited him from working on any matter he served as a "consultant" on during the previous year, according to the Office of Government Ethics.
Mr Cummings said the source was "authentic, credible, and reliable", and offered to introduce the individual to Mr Gowdy.