Former Rep. Tom Malinowski vowed Tuesday to oppose any candidate backed by the American Israel Public Affairs Committee following his defeat in the Democratic primary in New Jersey‘s 11th Congressional District.

Malinowski conceded the congressional special election primary to progressive activist Analilia Mejia on Tuesday after Mejia notched 889 votes more than Malinowski in her comeback win. Malinowski, the former representative from New Jersey’s 7th Congressional District, lost his bid after AIPAC spent over $2.3 million in attack ads against him. Malinowski praised Mejia’s “positive” and “inspiring” campaign but also railed against AIPAC in his concession post.