The cable, sent this week to US diplomatic posts around the world, instructed diplomats to announce the coalition and “ask for partner participation” by Friday.
It also told diplomats not to discuss the initiative with “US adversaries, including Russia, China, Belarus, and Cuba.”
According to the cable, which was first reported by the Wall Street Journal, the coalition will be led by the State and Defense Departments through US Central Command.
“The MFC will take steps to ensure safe passage, including providing real-time information, safety guidance, and coordination to ensure vessels can transit these waters securely,” the cable said.
President Donald Trump has on several occasions criticized NATO allies and European countries for not doing enough to help the United States reopen and secure the Strait of Hormuz which has been effectively closed after the Iran war.