Sen. John Fetterman (D-Penn.) is already facing a challenge in the Democratic primary less than a week after Democrats regain control of the Senate.

Ahmed Moor, a Palestinian American writer and businessman, threw his hat in the ring to unseat Fetterman.

“My name is Ahmed Moor and I’m running for U.S. Senate here in PA (election 2028),” he wrote on Twitter.

“I’m running to end the war in Iran and to promote the dignity agenda: free healthcare, free childcare, and affordable housing,” Moor added. “I’m calling for accountability for genocide, for ICE and for corruption. And finally, for the protection of our civil liberties in America.”

In an interview with The Philadelphia Inquirer, which first reported his candidacy, Moor said, “I’m not really running against Fetterman. I’m running for good government. I’m running for the rule of law. I’m running because I believe in America. And I believe in our capacity for renewal. I believe in our capacity for redressing wrongs in our midst.”

Fetterman has not said whether he will seek reelection in 2028.

Fetterman campaigned and won as a progressive outsider, but has since angered the Democratic base with his unquestioning support for Israel, backing Trump’s war with Iran, his close relationship with Donald Trump, and voting with the GOP.

Fetterman has said he will not switch parties, but Republicans have reportedly been trying to convince him to join their conference, and Trump has praised Fetterman as “a great guy” and said he would “love” him to become a Republican.

However, Fetterman’s position has weakened since Democrats won back control of the Senate in last week’s midterm elections, taking 54 seats and making the Pennsylvania lawmaker’s vote on legislation irrelevant.

Fetterman’s net approval rating among Pennsylvania Democrats has dropped 108 points since 2023, according to CNN, and a recent poll showed he was more popular among Pennsylvania Republicans than Democrats.

Pennsylvania Democrats are expecting the field of Fetterman challengers to grow as 2028 draws near.

“I’m pretty confident that you’ll see some bigger, mainstream kind of names involved,” Mike Weidinger, a veteran Lancaster County Democrat, said. “Generally, people think [Fetterman] either misrepresented himself when he ran the first time, or he changed completely from what he said he was.”

“We just had an election here in Pennsylvania where a lot of us busted our ass for [Pennsylvania governor Josh] Shapiro and a lot of other people, and he didn’t spend one penny or do one thing for a single Democrat candidate here last week,” Weidinger added.