A prominent Democrat and Jewish leader who served for decades as a New York lawmaker and now leads a group committed to fighting antisemitism announced Thursday he’s leaving his lifelong political party and becoming a Republican, arguing Democrats have become “radicalized” and “turned their back” on the Jewish people.

“It’s official: My wife and I have switched our party affiliation from Democrat to Republican!” Dov Hikind, who spent 36 years in the New York State Assembly and later founded Americans Against Antisemitism, tweeted.

“I am delighted to join the Republican Party,” Hikind added. “This is about sending a message — a message to the Biden administration, a message to the Democratic Party. We’re losing the American people because you are not representing our values. You are not representing the Democratic Party that my parents were so proud of.”

Hikind’s announcement came one day after some progressive Democrats boycotted a speech by Israeli President Isaac Herzog, who addressed a joint meeting of Congress to mark the 75th anniversary of Israel’s founding. During his speech, Herzog gave a thinly veiled rebuke to members of the House for recent attacks on Israel.

Overall, more than one million Americans have switched their party affiliation from Democrat to Republican in the last 12 months.