Sen. Martha McSally Martha Elizabeth McSallyThe Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Biden leads Trump by 4 points in new Arizona poll Airline job cuts loom in battleground states MORE (Ariz.), a Republican facing one of the toughest elections in November, launched her 2020 campaign Tuesday.

McSally’s campaign launched with a video featuring several supporters that she said “inspire” her to continue serving in the Senate. It touches on issues including prescription drug costs, sexual assault, human trafficking and improving access to mental health care.

“Those are just a few things we can agree upon in a bipartisan way, but there’s so many more. It’s an absolute honor to represent Arizona, and I humbly ask for the opportunity to continue to serve,” she says in the video.

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McSally lost her 2018 campaign to then-Rep. Krysten Sinema Kyrsten SinemaWhy Trump, GOP are running into trouble in Arizona Gun control group to spend at least million in Arizona ahead of November Democratic super PAC targets McSally over coronavirus response MORE (D-Ariz.) for the seat formerly held by 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 (R-Ariz.), who retired. McSally was later appointed to a seat vacated by the late Sen. John McCain John Sidney McCainThe electoral reality that the media ignores Kelly's lead widens to 10 points in Arizona Senate race: poll COVID response shows a way forward on private gun sale checks MORE (R-Ariz.).

She faces a tough challenge this year from Democratic candidate Mark Kelly, a former astronaut and husband of former Rep. Gabby Giffords (D-Ariz.). Giffords became a gun control advocate after surviving an assassination attempt in 2012.

Kelly has been outraising McSally in the race. He has more than $13 million on hand, while McSally has just around $7.7 million on hand.

The Cook Political Report rates the race as a “toss-up.”