Democratic Gov. Janet Mills is expected to join the growing field of contenders seeking to unseat U.S. Sen. Susan Collins next year.

That’s according to an internal document obtained by the news outlet Axios that reportedly says Mills, who cannot run for reelection to the Blaine House because of term limits, plans to make the announcement Tuesday.

It’s a marked turnaround for Mills, who said earlier this year that she had no plans to run for office once she finishes her stint as governor.

But Mills has become increasingly vocal with her concerns about the agenda of Republicans and the Trump administration.

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