Joint Comprehensive Plan of Action
France, the U.K. and Germany had attempted a last-ditch push to get Trump to change his mind in recent weeks.
The move puts the future of the 2015 international agreement in crisis.
"We should not scrap it unless we have a good alternative."
President Donald Trump set a May 12 deadline to decide what to do on the nuclear agreement.
WHAT'S HAPPENING
Senate Foreign Relations Committee chair Bob Corker hopes Europeans agree to tweak the accord ahead of a May 12 deadline that Trump could use to kill it.
"Right now it doesn’t feel like it’s gonna be extended," said Corker.
Trump’s new pick for secretary of state, Mike Pompeo, is fiercely opposed to the accord.