The White House has rejected a claim from an EU official that the US has softened its stance on withdrawing from the Paris climate accord.

Donald Trump shocked the world in June when he announced he would pull the United State from the accord.

But at a Montreal summit of 30 countries seeking headway on the agreement, a US envoy reportedly signalled a softening in the US President's stance on the deal.

“The US has stated that they will not renegotiate the Paris accord, but they will try to review the terms on which they could be engaged under this agreement,” European Commissioner for Climate Action and Energy Miguel Arias Cañete said.