Bannon, who blames Republican leaders for Trump’s lack of legislative progress, appealed to the Zionist Organization of America on Sunday to "work as partners" in his crusade against the GOP establishment.
"We're leading an insurgency movement against the Republican establishment," Bannon said in a fiery address at the organization's annual awards dinner in New York.
"That's how you get the Iran deal," he said. "That's how we still allow the American government to finance people that have blood on their hands of innocent Jewish civilians."
The Zionist Organization of America has largely embraced Bannon, while other Jewish leaders in the country have raised concerns about the far-right editor of Breitbart News, which is popular among some white supremacists.
"President Trump needs our back," Bannon declared. "We're a nation at war. This war is only going to be won if we bind together and work as partners."
Bannon, who left the White House in August, is considered a staunch supporter of Israel.
In a recent interview with The New York Times, Bannon indicated that the Republican Party would run into some trouble in the 2018 midterm elections.
He said Senate Majority Leader Mitch McConnell and his allies have been “the most outrageous” in their failure to support President Trump.
Asked if he believed Mitch McConnell would be leader this time next year, Bannon said, "I absolutely do not think he will be majority leader."
"It’s not my personal mission, but it is an objective that I — I have an objective that Mitch McConnell will not be majority leader, and I believe will be done before this time next year."
Bannon has pushed running challengers against some sitting Senate Republicans, calling for them to be replaced by candidates who support Trump’s “America First” agenda.