Maine House Speaker Sara Gideon, a Democrat, is expected to formally announce in the coming weeks that she’s running for Republican Sen. Susan Collins’ seat in 2020, five Democratic sources confirmed to HuffPost. She will likely launch her campaign shortly after the close of the state’s legislative session on June 19, the three Democratic sources in Maine and two national Democratic strategists said. Defeating Collins, the Maine moderate who infuriated liberals with her vote to confirm Brett Kavanaugh to the Supreme Court, is key to Democratic hopes of winning back control of the Senate in 2020. Gideon is a top-tier recruit for the race and is expected to have at least the tacit backing of establishment groups like the Democratic Senatorial Campaign Committee and EMILY’s List. At the same time, the Senate GOP is marshaling its resources to defend Collins, who has long outperformed other Republicans on the ballot in Maine. Gideon hinted last October that she would toss her hat in the ring following Collins’ controversial vote for Kavanaugh. “Maine deserves a champion in the US Senate,” Gideon wrote in a Facebook post at the time. “After November I will be seriously considering how I can elevate the voices of people who deserve and demand to be heard and represented in Washington, DC.” Gideon did not immediately respond to HuffPost’s request for comment.

Portland Press Herald via Getty Images Maine House Speaker Sara Gideon is the daughter of an Indian immigrant father and a second-generation Armenian American mother.

Gideon, a 47-year-old mother of three, has served in the Maine House of Representatives since 2012, representing the towns of Freeport and Pownal. Her legislative initiatives have focused on boosting the state’s economy, tackling the opioid crisis, investing in sustainable energy and increasing access to universal health care. Earlier this week, Maine Gov. Janet Mills (D) signed a bill sponsored by Gideon that expands access to abortion in the state by allowing health care professionals who are not doctors ― such as nurse practitioners and physician assistants ― to perform the procedure. Gideon is a graduate of George Washington University and the daughter of an Indian immigrant father and a second-generation Armenian American mother. Two other Democrats have formally announced 2020 bids against Collins. Betsy Sweet, who ran and lost in the Democratic primary for Maine governor last year, said that she’s running on Thursday. Bre Kidman, a lawyer and the first openly non-binary U.S. Senate candidate in the country, filed to run in April. Sweet appears to be Gideon’s most direct competition for the Democratic nomination. She finished a surprising third in that gubernatorial primary in 2018 and has already won the endorsement of the progressive group Democracy for America this time around. She also relied on public financing for that race, which won’t be available in the Senate contest. “In the U.S. Senate, [Sweet will] be an unabashed champion for abortion rights, Medicare for All, a $15 minimum wage, organized labor, and criminal justice reform,” Yvette Simpson, the president of Democracy for America, said in a statement on Thursday. “In 2014, far too many National Democrats made a huge mistake by giving Susan Collins a pass on what should have been a reelection fight. In 2020, we can’t just fix that mistake by ending Susan Collins’ career, we must replace her with someone who’ll be a strong fighter for our shared progressive values.” Nationally, establishment-backed Democrats have rarely lost Senate primaries in recent years. The Maine primary is June 9, 2020.

ASSOCIATED PRESS Sen. Susan Collins speaks to reporters following a Senate policy luncheon on Capitol Hill in Washington on April 2.