Senate Foreign Relations Committee Chairman Bob Menendez has invited the top United Nations nuclear watchdog for a briefing on Iran’s nuclear program that puts the top Senate Democrat on a collision course with President Joe Biden’s plan to revive the 2015 Iran nuclear deal.

“Iran’s refusal to cooperate with the IAEA is setting a dangerous precedent and weakening the global non-proliferation regime,” the New Jersey senator wrote to International Atomic Energy Agency chief Rafael Grossi in a Sept. 20 letter obtained by the Washington Examiner. “If Iran is allowed to frustrate the IAEA’s efforts without consequence, other states are likely to follow its example and similarly defy IAEA requests for access to nuclear sites or resist providing the IAEA with complete nuclear declarations.”