The theory is that the congressional seal has a Star of David on it, leading to an inference that the Jews control Congress.
Since Obama hates Israel, the Israelis have been extra-energetic about cultivating ties with Congressmen and Senators. Israel still has lots of friends there (Congress) despite Obama and his gawd awful State Department.
The cartoon is stupidly saying that Congress is wrong to hold back Obama from having closer relations with Iran which I means caving in 100% on Iranian nuclear bomb programs.