President Obama mocked Gov. Scott Walker – an expected 2016 Republican presidential candidate – for vowing to revoke the administration’s nuclear understanding with Iran on the first day of a possible Walker presidency.

“It would be a foolish approach to take, and, you know, perhaps Mr. Walker, after he’s taken some time to bone up on foreign policy, will feel the same way,” Obama said, in an interview with National Public Radio.

Obama defended his decision to bring about an “international agreement” with Iran outside of Congress, signaling confidence in the legality of his actions. A president, he argued, had certain international negotiation powers, citing the “traditions and precedents” of the office.

“If that starts being questioned, that’s going to be a problem for our friends and that’s going to embolden our enemies,” he asserted.