Maine Gov. Janet Mills is expected to launch a campaign for Senate on Tuesday, two Democratic sources familiar with her plans confirmed to CBS News.

A Democrat, Mills is vying to unseat longtime Republican Sen. Susan Collins in one of the most closely watched contests of next year's midterm elections.

Mills' planned campaign launch was first reported by Axios .

Mills, who is term-limited, has served as governor of Maine since 2019, after working as the state's attorney general. She drew national attention earlier this year when she verbally argued with President Trump at a White House event after he pressed Maine to comply with his administration's push to block transgender girls and women from competing in female sports.

"See you in court," Mills said to Mr. Trump.

Mills was

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