Former national security adviser Susan Rice said Thursday that she will not challenge Sen. Susan Collins Susan Margaret CollinsSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-Maine) for her Senate seat in 2020.

Rice said that Collins's vote to confirm Supreme Court Justice Brett Kavanaugh Brett Michael KavanaughOvernight Health Care: US coronavirus deaths hit 200,000 | Ginsburg's death puts future of ObamaCare at risk | Federal panel delays vote on initial COVID-19 vaccine distribution Senate GOP sees early Supreme Court vote as political booster shot Trump says he'll make Supreme Court pick on Saturday MORE despite allegations against him of sexual misconduct caused her to consider challenging Collins.

"I was deeply disappointed when Susan Collins decided to vote for Brett Kavanaugh,” Rice said at the 10th Annual Women in the World Summit in New York. “It felt like a betrayal, frankly, to all women, and it made me think very seriously about whether I ought to run for Senate in 2020.”

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But Rice said she was not ready to move her family to Maine full time and did not want to put them through the stress of a campaign.

“In the course of weighing it all, I’ve decided with my family that the timing really isn’t right for us,” she said. “I’ve got a daughter going into her junior year in high school in Washington and this is not the time to move ourselves full-time up to Maine and to put my family through the stresses of a campaign.”

Rice added that this does not mean she won't run for office in the future.

"I don’t rule out running for office in the future,” she said. “In Maine or beyond.”

Rice previously hinted that she would challenge Collins. When former White House communications director Jen Psaki asked on Twitter, "Who wants to run for Senate in Maine?" Rice responded "Me." She later clarified that she was "not making any announcements."

Rice served as an adviser in the Obama administration and also served as ambassador to the United Nations.

Collins, a moderate, is seen as a potentially vulnerable senator ahead of the 2020 elections, as Maine is a primarily Democratic state. She was one of three Republican senators to vote against repealing the Affordable Care Act, but voted to confirm Kavanaugh.

Sen. Joe Manchin Joseph (Joe) ManchinThe Hill's Morning Report - Sponsored by Facebook - Trump, GOP allies prepare for SCOTUS nomination this week Trump meets with potential Supreme Court pick Amy Coney Barrett at White House Names to watch as Trump picks Ginsburg replacement on Supreme Court MORE (W.Va.), the only Democrat who voted to confirm Kavanaugh, said Thursday that he supports Collins's reelection bid and offered to campaign for her.