Four-term Republican Rep. Chris Collins of New York has resigned from Congress, one day before he was expected to plead guilty to charges of insider trading.

House Speaker Nancy Pelosi “is in receipt of a letter of resignation” from Collins, which was to be made effective Tuesday morning when brought to the floor of the House, her spokesman Drew Hammill told CNBC.

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Collins was indicted in August on charges of using his board position at Innate Immunotherapeutics, an Australian-based pharmaceutical company, to tip off his son that the company’s primary drug, a treatment for a form of multiple sclerosis, had failed its drug trial before the information was made public.

Shares in Innate fell by 92% after news of the failed drug trial became public. But being privy to insider information from his father, Cameron Collins and the father of his fiancée, Stephen Zarsky, were able to offload their shares in the company and avoided over $768,000 in losses “that they would have otherwise incurred if they had sold their stock in Innate after the Drug Trial results became public,” the indictment stated.

Collins initially entered a not guilty plea in September following his indictment, but on Monday a “change of plea hearing” was filed in his case, indicating that he likely had a change of heart and would plead guilty to the charges during a hearing Tuesday.

Collins was the first member of Congress to publicly endorse Donald Trump’s presidential campaign in 2016.

Collins’ office did not return a request for comment from The Daily Caller News Foundation in time for publication.

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