Former Arizona Attorney General Grant Woods (D) announced on Friday that he will not run for the Democratic nomination to challenge 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-Ariz.) in 2020.

Woods, who served as the late Sen. John McCain John Sidney McCainBiden's six best bets in 2016 Trump states Replacing Justice Ginsburg could depend on Arizona's next senator The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy MORE’s (R) first chief of staff in Congress, recently switched his party affiliation and had been seriously considering a Senate run as a Democrat.

Woods made the announcement during a Friday interview with local radio station KTAR News 92.3, saying he met with media consultants and pollsters about his chances to defeat McSally.

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But he said that given Arizona’s late August primary, he didn’t want to fight against other Democrats in what is expected to be a contested primary.

“I think I can beat her and I think I am the person to beat her. However ... it’s pretty clear there would be a Democratic primary if I run,” Woods told KTAR on Friday. “I’m not interested in running the next 18 months against Democrats.”

Woods had backed Sen. Kyrsten Sinema (D), who went on to defeat McSally in the 2018 midterm election.

Sinema had been introducing Woods in Washington, D.C., and previously met with Senate Minority Leader Charles Schumer Chuck SchumerJacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee CNN's Toobin: Democrats are 'wimps' who won't 'have the guts' to add Supreme Court seats Republican senator says plans to confirm justice before election 'completely consistent with the precedent' MORE (D-N.Y.) and Sen. Catherine Cortez Masto Catherine Marie Cortez MastoDemocratic Senate campaign arm raised nearly M in August VA problems raise worries about mail slowdown, prescriptions Cortez Masto touts mail-in voting in convention speech MORE (D-Nev.), who heads the Democratic Senatorial Campaign Committee (DSCC).

But as a former Republican, Woods had frustrated some progressives for past comments on a radio show that were critical of now-Speaker Nancy Pelosi Nancy PelosiTrump puts Supreme Court fight at center of Ohio rally CDC causes new storm by pulling coronavirus guidance Overnight Health Care: CDC pulls revised guidance on coronavirus | Government watchdog finds supply shortages are harming US response | As virus pummels US, Europe sees its own spike MORE (D-Calif.), according to Yellow Sheet Report, an Arizona political tip sheet.

Woods said he expected other Democrats to run to the left of him, noting that he’s “not too big on either party.”

Instead, Woods said he plans to get involved in the 2020 presidential race to defeat President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE. He said he will endorse a candidate and “be as involved as they’ll let me be.”

With Woods out of the running, retired astronaut Mark Kelly and 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.) are seen as the top Senate challengers for Democrats. Both have also met with Schumer and Cortez Masto.

Arizona is high on Democrats’ priority list, as they seek to take back the Senate in 2020. Republicans hold a 53-seat Senate majority.

McSally was appointed to fill McCain’s seat until the 2020 special election after it had been initially held by former Sen. Jon Kyl (R).

Whoever wins the seat in 2020 will serve out the remainder of McCain's term, which expires in 2022.