US President Donald Trump will decide what to do regarding the bloc after ending the war with Iran, the Pentagon chief has said

US War Secretary Pete Hegseth has refused to reaffirm Washington's commitment to NATO's collective defense, pointing to the bloc's refusal to assist or participate in the American-Israeli war on Iran. 

Speaking at a Pentagon press briefing on Tuesday, Hegseth stated that the future of US involvement in NATO will ultimately be decided by President Donald Trump, but noted that many issues with the bloc have been "laid bare" in the Iran conflict. 

"A lot has been shown to the world about what our allies would be willing to do for the US when we undertake an effort of this scope on behalf of the free world," Hegseth said. He argued that Iranian missiles did not pose a threat to the US, but to its "allies and others," who responded to Washington's request for assistance with "questions, or roadblocks, or hesitations." 

"The President is pointing out that you don't have much of an alliance if you have countries that are not willing to stand with you when you need them," Hegseth said.

In an interview with the Telegraph published on Wednesday, Trump himself confirmed that he is strongly considering pulling the US out of NATO if it fails to join the war against Iran, labelling the bloc a "paper tiger."

US Secretary of State Marco Rubio similarly suggested in an interview with Fox News that Washington would have to "re-examine" its NATO membership when the war against Iran comes to an end, arguing that "if NATO is just about us defending Europe if they're attacked, but them denying us basing rights when we need them, that's not a very good arrangement. That's a hard one to stay engaged in."

A number of NATO states have opposed the unprovoked war being waged on Iran by the US and Israel, with several members, including France and Spain, openly refusing to participate in the operation or allow Washington to use their bases or airspace for attacks.

Trump has repeatedly lashed out at bloc members for their reluctance, branding them "cowards" on social media and claiming that NATO was "a one-way street" and that the US "no longer 'need[s]', or desire[s], the NATO countries' assistance."