Sen. Martha McSally Martha Elizabeth McSallySenate Republicans face tough decision on replacing Ginsburg Democratic senator calls for eliminating filibuster, expanding Supreme Court if GOP fills vacancy What Senate Republicans have said about election-year Supreme Court vacancies MORE (R-Ariz.) is tying her Democratic challenger Mark Kelly to progressive presidential candidate Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.) in a new ad released Tuesday.

“Kelly and Sanders, too liberal for Arizona,” the narrator says in the 30-second ad titled “Bernie Bro.”

“Kelly is quickly making the choice in this election very clear – a vote for Kelly is a vote for the Bernie Sanders socialist policies of government takeover of healthcare, open borders, and massive tax hikes on the middle class,” McSally campaign manager Dylan Lefler said in a statement announcing the ad. “Mark Kelly will be Sanders 51st vote in the Senate."

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The ad claims Kelly said he would support Sanders, though Kelly has given more measured responses when pressed by local news outlets about his support for the Democratic primary’s front-runner.

"Another week and more of the same negative and false attack ads that Arizonans are tired of and rejected in 2018," Kelly spokesman Jacob Peters said in a statement. "Mark is an engineer, combat pilot, and astronaut running to be an independent voice in the Senate, and he will stand up to anyone in either party when it’s right for Arizona.”

Asked last week if he would support Sanders if the Vermont senator became the nominee, Kelly told The Arizona Republic, “I will ultimately support who the nominee is of the Democratic Party, that’s clear.”

“There’s 900 delegates that one person is going to need to receive to be the nominee, we’re really at a small number right now,” he added.

A local CBS affiliate reported that Kelly said “we’ll have to see who the nominee is,” when asked if he’ll support the candidate no matter who it is.

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Kelly, a retired NASA astronaut and husband of former Rep. Gabrielle Giffords (D-Ariz.), has been outraising McSally in the Senate race.

McSally launched her campaign earlier this month. She lost her 2018 Senate race against Sen. Kyrsten Sinema (D), who flipped the seat held by retiring Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeRepublican former Michigan governor says he's voting for Biden Maybe they just don't like cowboys: The president is successful, some just don't like his style Bush endorsing Biden? Don't hold your breath MORE.

McSally was later appointed to fill the seat vacated by the late Sen. John McCain John Sidney McCainMcSally says current Senate should vote on Trump nominee Say what you will about the presidential candidates, as long as it isn't 'They're too old' The electoral reality that the media ignores MORE (R-Ariz.).

The nonpartisan Cook Political Report rates the 2020 Senate race in Arizona a “toss-up.”

--This report was updated on Feb. 19 at 12:17 p.m.