Senator Tim Kaine will introduce a resolution targeting potential military action against Oman when the Senate returns next month.
The president threatened to bomb Oman if it obstructs efforts to reopen the Strait of Hormuz, despite Muscat’s role as a US ally and mediator in the US-Iran conflict.
The administration says its military campaign is aimed at preventing Iran from obtaining a nuclear weapon and insists Congress has received regular briefings on the conflict.