President Donald Trump has threatened to leave NATO after allies refuse to participate in the Iran War, calling the alliance "a paper tiger" and "a one-way street". This comes after a long dispute with NATO over joining the U.S. and Israel in the war against Iran, which has escalated after several NATO nations agreed to contribute to efforts to reopen the Strait of Hormuz, which Iran has closed to most shipping traffic. The president also criticizes NATO for not providing "automatic" support for efforts to reopen the strait. Secretary of State Marco Rubio suggested that the US would need to review its relationship to NATO following the end of the Iran war. The threats have cast doubt on the alliance's collective defense clause and have led to concerns about Trump's commitment to the treaty.