Pete Buttigieg and Elizabeth Warren, speaking to the J Street conference, also backed using defense assistance as a pressure tool, but in more restrained terms.
Democratic presidential candidate hopeful Amy Klobuchar said it would be unwise to cut aid at a time that the Trump administration is making the region dangerous.
Bernie Sanders is among the hopefuls who will discuss the U.S.-Israel relationship, the Israeli-Palestinian conflict and American foreign policy in the Middle East.