ORANGE COUNTY (CBS) — An 18-year-old Orange County woman says she was the victim of an unwanted sexual encounter with Congressman David Wu, prompting the Oregon lawmaker to resign.

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Within days of the woman’s accusation, Democratic leaders requested a House ethics committee investigation.

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Wu was elected to Congress 13 years ago.

He is the first Chinese American to serve in the House.

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The lawmaker says he’s resigning to avoid being a distraction.