President Trump’s anticipated decision to exit the 2015 nuclear agreement with Iran comes as his administration seeks cooperation with North Korea, and sources close to the process say the president is somewhat worried about the long-term consequences.

Trump has spent months threatening to ditch the deal by reinstating economic sanctions against Iran when they expire on May 12. He has often seized on the agreement’s inclusion of so-called “sunset clauses” that fail to permanently prevent Iran from becoming a nuclear power.