The United States has little global support for any potential conflict with Iran (Newsweek)

U.S.-IRAN CRISIS: TRUMP ADMINISTRATION HAS LITTLE INTERNATIONAL SUPPORT FOR WAR
BY TOM O'CONNOR ON 5/15/19 AT 3:54 PM EDT
Newsweek

...The administration’s policy has clearly been to portray Iran as the bad guy here. Iran isn't the bad guy here for a change," Dina Esfandiary, a fellow at The Century Foundation think tank and the Belfer Center at Harvard University's Kennedy School. "It's important to highlight that, on this issue, America is really isolated; Europe, Russia, China, no one is really buying into this push against Iran."

...the U.S. decided to invade Iraq in 2003—a decision in which Bolton played an integral role. He was one of a number of U.S. officials within President George W. Bush's administration that repeated the claim that Iraqi President Saddam Hussein possessed weapons of mass destruction and supported militant groups, two charges that later turned out to be false. Though the U.S. managed to convince the U.K., Australia and Poland to join in on that mission, there was little chance it could do the same under the present circumstances.

....Susanne DiMaggio, a senior fellow at the Carnegie Endowment for International Peace, told Newsweek..."The Europeans devoted a great deal of time and energy to negotiating the nuclear deal—they view it a concrete example of how to avert military conflict through diplomacy," she added. "The last thing they will want to do is throw away all that they achieved through peaceful means by joining forces with Trump and Bolton on a fiasco in the making."

https://www.newsweek.com/us-iran-trump-little-support-war-1426578