The Arizona senator’s clash with Donald Trump transformed him from a relative unknown into a serious 2028 presidential prospect almost overnight.

Just over a year ago, Sen. Mark Kelly barely registered in conversations about future Democratic presidential candidates. Today, the 61-year-old Arizona Democrat is seriously considering a White House run, his national profile dramatically elevated by a high-stakes confrontation with President Donald Trump that triggered a fundraising surge and positioned him as one of the Democratic Party’s most prominent Trump critics.

Kelly has said he will decide after the 2026 midterm elections.

“It’s a serious decision,” he told the BBC. “I just haven’t made it yet.”

The Moment That Changed Everything

In November 2025, Kelly and five other congressional Democrats with military backgrounds released a video reminding active-duty personnel of their legal duty to disobey unlawful orders. President Trump’s response was swift and explosive, accusing the lawmakers of “SEDITIOUS BEHAVIOR, punishable by DEATH.”

The fallout was immediate. Defense Secretary Pete Hegseth moved to demote Kelly from his retired Navy rank, a step that would have reduced his military pension. A federal judge blocked the demotion in February 2026, criticizing the move as an attempt “to intimidate and silence a military veteran.”

Kelly and his wife, former Rep. Gabrielle Giffords, began receiving death threats on a weekly basis, requiring round-the-clock security.

Fundraising Surge

The clash with Trump transformed Kelly’s fundraising operation. His daily donations spiked to 20 times the average following Trump’s comments, with his campaign raising $1 million on Nov. 30 alone.

He raised more than $12.5 million in the final quarter of 2025 and now holds $33 million — more than any other senator facing reelection in 2028 — funds he could potentially use for a presidential run.

Who Is Mark Kelly?

Before entering politics, Kelly built an extraordinary résumé.

He grew up in West Orange, New Jersey, where both of his parents worked as police officers. His elementary school has since been renamed in honor of him and his twin brother. As a Navy fighter pilot, he flew 39 combat missions during Operation Desert Storm.

In 1996, NASA selected Kelly and his identical twin brother, Scott, as space shuttle pilots — the only siblings to both become astronauts. Kelly flew four space shuttle missions over a decade and commanded two of them.

On Jan. 8, 2011, his wife, then-Rep. Gabrielle Giffords, was shot in the head at a constituent event near Tucson. Six people were killed. Giffords survived but later resigned from Congress. The shooting thrust Kelly into national prominence. He and Giffords later founded the organization now known as Giffords, which advocates for gun safety laws.

In 2020, Kelly defeated Republican Martha McSally to win Sen. John McCain’s former seat, becoming the first Democrat in decades to hold it. He won reelection in 2022 by a comfortable margin.

If he runs, he would join a long line of presidential contenders with New Jersey ties, including Sen. Cory Booker and former Gov. Chris Christie.

The 2028 Landscape

Early betting markets list California Gov. Gavin Newsom as the frontrunner at 7-2 odds for the Democratic nomination, followed by Rep. Alexandria Ocasio-Cortez at 12-1. Kelly is currently at 16-1, alongside former Vice President Kamala Harris.

Political observers cite several strengths: his military and NASA background, his ability to win twice in the swing state of Arizona and his $33 million campaign war chest.

Democratic leaders in early-voting states are paying attention. New Hampshire Democratic Party Chair Raymond Buckley called Kelly “a very credible candidate” whose “backbone is exactly the sort of stuff that New Hampshire people like.”

Potential weaknesses include his relatively short political career — just six years in the Senate. Some describe him as reserved compared with flashier speakers, though supporters argue he commands attention in his own way.

Sources

Newsweek — “Mark Kelly’s Chances in 2028 Election as He Will ‘Seriously Consider’ a Run” (February 17, 2026)

Phoenix New Times — “Mark Kelly for President? Trump May Have Boosted His Chances” (February 18, 2026)

Cronkite News (Arizona PBS) — “Mark Kelly for President? Trump May Have Boosted His Chances” (February 18, 2026)

USA Today — “Who Is Mark Kelly? Trump Antagonist, Arizona U.S. Senator, Space Pilot” (November 23, 2025)

The Arizona Republic — “Who Is Mark Kelly? Arizona Senator in Spotlight for Defying Trump” (January 7, 2026)

BBC News — “US Senator Mark Kelly Tells BBC He Will ‘Seriously Consider’ White House Run” (February 17, 2026)

The Boston Globe (Associated Press) — “Who Is Mark Kelly, the Senator the Pentagon Is Targeting for Urging Troops to Defy Illegal Orders?” (November 25, 2025)

Tucson Sentinel — “Trump Clash, Fundraising Boom Elevate Sen. Mark Kelly’s 2028 Presidential Prospects” (February 18, 2026)