President Barack Obama met on Monday with a group of Jewish leaders at the White House in an effort to win their support for the Iran deal–and for passing that deal without approval from Congress. The details of the meeting were not posted, but The Hill reports that the Obama administration sees the outreach as a key part of its effort to prevent the Corker bill, which would require congressional approval of an Iran deal, from reaching the two-thirds majority threshold.

According to the Treaty Clause of the U.S. Constitution (Article II, Section 2, Clause 2), treaties must be ratified by a two-thirds vote in the Senate. Federalist No. 75 makes clear that “treaty” includes contracts between the U.S. government and foreign governments.

The Iran deal, by the administration’s own admission, would be one of the most important agreements entered into by the U.S. government in a generation–far more important than a typical “executive agreement.”