Rep. Seth Moulton (D-MA), who on Wednesday announced a primary challenge to Sen. Ed Markey (D-MA), announced Thursday that he will return donations he has received from AIPAC and will reject further donations from the group.

Massachusetts is a solidly Democratic state but has also a large population of Jewish pro-Israel voters who might be inclined to support the more-moderate Moulton. Though his record on Israel policy is somewhat mixed, Moulton’s record on the issue is more pro-Israel than that of Markey, who is a prominent critic of Israel and has voted repeatedly against weapons transfers to the Jewish state.

“I support Israel’s right to exist, but I’ve also never been afraid to disagree openly with AIPAC when I believe they’re wrong. In recent years, AIPAC has aligned itself too closely with Prime Minister [Benjamin] Netanyahu’s government,” Moulton said in a statement. “I’m a friend of Israel, but not of its current government, and AIPAC’s mission today is to back that government. I don’t support that direction. That’s why I’ve decided to return the donations I’ve received and will not be accepting their support.”

According to campaign finance watchdog group Open Secrets, Moulton received around $43,000 from AIPAC and its supporters in the 2024 election cycle, out of a total of $2.8 million raised. The Boston Globe reported that Moulton plans to return $35,000 in donations from the current election cycle.

AIPAC issued a blistering statement in response to Moulton.

“Rep. Moulton is abandoning his friends to grab a headline, capitulating to the extremes rather than standing on conviction,” spokesperson Marshall Wittmann said in a statement. “His statement comes after years of him repeatedly asking for our endorsement and is a clear message to AIPAC members in Massachusetts, and millions of pro-Israel Democrats nationwide, that he rejects their support and will not stand with them.”

Moulton’s stance echoes those taken by other prominent Democratic candidates across the country seeking to appeal to the progressive Democratic base increasingly hostile to Israel.

Moulton’s changed stance on accepting support from AIPAC is a sign of how even more-moderate Democrats are facing pressure from the party’s activist base to distance themselves from embracing Israel. The Massachusetts congressman had been endorsed by AIPAC prior to declaring his Senate campaign.

“I’m cautiously optimistic that the recent breakthrough in Gaza will move us closer to ending the horrific violence in the region,” Moulton added in the statement. “A political resolution that allows Israelis and Palestinians to live side by side in peace is exactly the kind of framework I’ve been calling for from the beginning.”