"A massive Armada is heading to Iran. It is moving quickly, with great power, enthusiasm, and purpose," Trump wrote on Truth Social.
The force would be larger than one previously sent to Venezuela and is prepared to fulfill the mission rapidly if needed, the US leader stressed.
"Hopefully Iran will quickly "Come to the Table" and negotiate a fair and equitable deal - NO NUCLEAR WEAPONS - one that is good for all parties. Time is running out, it is truly of the essence!" Trump added.
The president warned that if no agreement is reached, any future US strike on Iran would be "far worse" than previous actions.