Rep. Ruben Gallego Ruben GallegoHispanic caucus report takes stock of accomplishments with eye toward 2021 Senators call on Pentagon to reinstate funding for Stars and Stripes newspaper Hispanic Caucus campaign chief to mount leadership bid MORE (D-Ariz.) will not seek Arizona’s Senate seat in 2020, increasing the odds that retired astronaut Mark Kelly will not face a major opponent in the Democratic primary, according to the Arizona Republic.

Kelly is looking to unseat Sen. Martha McSally Martha Elizabeth McSallyTumultuous court battle upends fight for Senate Grassley, Ernst pledge to 'evaluate' Trump's Supreme Court nominee The Hill's Campaign Report: Biden goes on offense MORE (R), who was appointed by Gov. Doug Ducey (R) to complete the term of the late Sen. John McCain John Sidney McCainCindy McCain endorses Biden: He's only candidate 'who stands up for our values' Biden says Cindy McCain will endorse him Biden's six best bets in 2016 Trump states MORE (R) following the resignation of interim Sen. Jon Kyl (R).

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Kelly, who announced his campaign his campaign in February, is married to former Rep. Gabrielle Giffords (D-Ariz.), who left Congress shortly after she was injured in a 2011 shooting.

Gallego, a three-term representative, is a favorite on the party’s left flank and recently met with donors and key figures in the state Democratic party, according to the newspaper, but he ultimately decided to run for reelection in his solidly Democratic congressional district.

“I don’t want to engage in a bitter primary all the way until the general election, and then turn around and try to run, whether it’s me or Kelly, against McSally in a year when the Democrats need to win the Senate seat and take the state,” Gallego told the newspaper. “It’s just not in the best interest of the state or the Democratic Party to be engaging in that. ... If Republicans are excited to see a spirited and nasty primary, they’re going to have to look somewhere else because I’m not going to take part in that.”