Earlier, Iranian Foreign Minister Javad Zarif argued that the United States had failed to create an allied naval coalition in the Persian Gulf because Washington is "alone in the world" and "countries that are its friends are too ashamed of being in a coalition" with the US.
If Iranian forces attempt to board U.S. -flag vessels, the Maritime Administration said, the crew should identify the ship, "affirm that they are proceeding in according with worldwide law" and "immediately inform the U.S. Fifth Fleet Battle Watch".
"The Islamic Republic of Iran has announced its opposition to the formation of such coalitions and considers it a deceptive act which create tensions", he added.
Tensions between Washington and Tehran - Saudi Arabia's arch foe - have soared since U.S. President Donald Trump pulled the United States out of a nuclear deal with Iran past year and imposed punishing sanctions.
Mousavi also said Tehran will regard the organizers, founders, and members of such a coalition as the culprits behind possible tensions and crises that would emanate from such a move.
Iran says the responsibility of securing these waters lies with Tehran and other countries in the region.
Mr. Pompeo, on Twitter, also talked of a "fruitful conversation" with the Saudi crown prince and said he "thanked him for his involvement and support on many issues in the region". Iran says the drone was in its airspace, but Washington says it was in global skies.
According to local reports, Israeli Foreign Minister Israel Katz said on Tuesday that Tel Aviv will join the USA -led coalition. However, so far only the United Kingdom has said it would join the U.S.in protecting tankers after the UK-flagged tanker Stena Impero was seized by Iran last month. "We consider it as part of our territory and believe that the presence of foreign forces there is unacceptable", Mousavi was quoted by the IRNA news agency as saying, reported Russian state news agency TASS.
Hatami said, "We are committed to the security of the Persian Gulf". "We're not looking to hurt Iran", Trump added.
President Paul Ludlow said the cruise line has withdrawn its Oceana ship, which flies the British flag, from the gulf.