However each Washington and Riyadh have dominated that out and pinned the blame on Saudi's arch-foe Iran.
Iran denies involvement in the September 14 attack that initially halved Saudi oil output and which Pompeo earlier called an act of war against the world's largest oil exporter.
U.S. Secretary of State Mike Pompeo speaks to the media before departing from al-Bateen Air Base in Abu Dhabi, United Arab Emirates, Thursday, Sept. 19, 2019, as U.S. special representative on Iran Brian Hook, left, listens.
"We'd like a peaceful resolution. And we'll see", Trump told reporters in Los Angeles.
He did not provide details about the coalition. Iran denies being behind the tanker explosions, though they came after Tehran threatened to stop oil exports from the Persian Gulf.
"Earlier in the day, Zarif reacted to Pompeo's allegations against Iran in another tweet, saying, "'Act of war' or AGITATION for WAR?
Iran's foreign minister has threatened "all-out war" in case of strikes against his country by the us or Saudi Arabia.
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After meeting with Saudi Crown Prince Mohammed bin Salman (MBS) on Thursday, Pompeo tweeted that the U.S. backs the kingdom's "right to defend itself" and that "the Iranian regime's threatening behavior will not be tolerated". Pat Ryder, who joined Hoffman at a Pentagon briefing, said the military has no immediate plans, and had received no directions, to bolster forces in the region.
Britain and Bahrain previously said they are participating but most European countries have been reluctant to sign up for fear of stoking regional tensions.
Iraq's Foreign Ministry said on Thursday it would not join the global maritime mission, the Iraqi state news agency reported.
He said on Wednesday he will increase financial sanctions on Tehran over the attack. That country's Houthi rebels claimed the oil field attack Saturday in Saudi Arabia, although the US alleges Iran carried it out.
He said US forensics teams are on the ground working with the Saudis to get a definitive assessment of the source and scope of the attacks, which initially knocked out about half of the Saudi oil production.
On doing negotiations with the U.S, Zarif said, that would not happen until Washington withdraws all sanctions it committed under the 2015 nuclear deal.
A Czech company whose small jet engine is believed to have been used in a cruise missile that attacked a key Saudi Arabian oil installation says it was a low-quality copy, not their genuine product.
The multinational maritime alliance was proposed by the U.S.in June after Iran was first accused of attacking oil tankers in the Gulf.
Iran's Zarif accused Pompeo of trying to "dodge a US obligation" to issue visas for Iran's United Nations delegates. In June, after Iran shot down an American surveillance drone, Trump initially endorsed a retaliatory military strike then abruptly called it off because he said it would have killed dozens of Iranians.