The issue focused on whether the U.S. could keep its commitments to the Paris Climate Agreement, which would curb carbon emissions. Obama said he was "concerned" by the proposal.

"I will review this proposal, if there are enough facts to show that it would actually increase the climate threat," Obama said, citing climate change research. "It's going to be very difficult, given what we know about climate change, given that we're going to see more storms, given what we know about