PORTLAND, Maine (AP) — Maine’s two-term Democratic Gov. Janet Mills will run for the U.S. Senate seat held by veteran Republican Sen. Susan Collins next year, two people familiar with Mills’ plans said on Friday.

The development sets up a potential showdown between the parties’ best-known figures in a state where Democrats see a chance to gain a seat in their uphill quest for the Senate majority.

Mills is tentatively expected to announce her candidacy on Tuesday, according to the people, who insisted on anonymity to discuss plans they were not authorized to share publicly.

Mills was the top choice of national Democrats who have long tried to unseat Collins, who has held the seat since 1997. She was urged to run by party leaders including New York Sen. Chuck Schumer, the Senate minority

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