Iran has denied holding any talks with the U.S. after President Donald Trump announced negotiations would begin Monday to end the six-month war.

The rebuttal by the Iranian Foreign Ministry follows Trump saying he had held off launching new strikes on the Islamic Republic to allow for further diplomatic efforts, a familiar pattern in the conflict.

Washington and Tehran have been at war since Feb. 28, when the U.S. and Israel launched surprise strikes against Iran, though months of on-off diplomacy have led to periods of relative calm.

Trump last week threatened to hit Iran "very hard," with the U.S. leader reportedly considering renewed attacks, including against energy infrastructure.

But the president pulled back from that threat Saturday, saying the "perimeters" of a deal were there.