NEW YORK (CBSNewYork) — New York Congressman Chris Collins resigned Monday, one day before he’s expected to plead guilty to insider trading.

Collins, a Republican from the Buffalo area, is accused of leaking confidential information.

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He’s expected to enter the plea Tuesday in Manhattan federal court, where he faced conspiracy, securities fraud and wire fraud charges.

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Collins was one of the first members of Congress to support Donald Trump’s presidential campaign.

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His resignation will take effect Tuesday when Congress meets for a brief session.