(CNN) - New York Rep. Chris Collins has resigned amid expectations that he will plead guilty Tuesday to federal charges in an insider trading case, according to various news outlets.
The first sitting congressman to back President Donald Trump's bid for the White House, Collins was reelected to office several months after he was originally indicted in the insider trading case.
He faced reelection in 2020, and a guilty plea wouldn't have necessarily cause him to immediately lose his congressional seat unless he resigned or if the House of Representatives expelled him, which would have required a full vote of the House.
It's not clear if Collins, who was charged by the Manhattan U.S. Attorney's office, is set to plead guilty to precisely the same set of charges contained in the indictment against him, which was originally filed in August 2018 and was revised the following August.
Collins' attorneys, Jonathan New and Jonathan Barr, didn't immediately respond to a request for comment.
Collins' co-defendants -- his son and another man -- are also set to change their pleas on Thursday, according to court filings.
Collins and his co-defendants had pleaded not guilty twice in the case, once after the original set of charges in August 2018 and a second time -- to the revised charges contained in what's known as a superseding indictment -- earlier this month.
Federal prosecutors in the Manhattan US Attorney's office allege that the defendants acted on non-public information about the results of a drug trial, which was then used to trade on the stock of the pharmaceutical company, Innate Immunotherapeutics Limited, of which Collins was a board member.
The indictment didn't allege that Collins himself traded on information about the failed results of a drug trial, but that he passed the information to his son so that his son could execute trades. The superseding indictment narrowed the charges against Collins, dropping some, but not all, of the securities fraud counts.
Speaking outside the courthouse after his second not guilty plea, Collins said he hadn't decided whether to run for reelection in 2020, adding that he would decide by the end of this year. "I look forward to being exonerated in due course," he said at the time.
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