Washington DC, April 18 -- US President Donald Trump on Friday (local time) warned that Washington will act more aggressively to secure Iran's nuclear materials if an agreement aimed at achieving a complete halt to the hostilities in West Asia is not reached, reiterating that the US would secure nuclear materials of the Islamic Republic "in a much more unfriendly way" if diplomacy fails.

Speaking to reporters aboard Air Force One during a press gaggle, Trump said the US expects cooperation from Tehran on securing nuclear-related materials and reiterated that Washington prefers a negotiated settlement but is prepared for alternative measures if necessary.

"Somewhere after the signing of the agreement, we'll go with Iran. We'll go in with...