India, May 23 -- US Secretary of State Marco Rubio said on Friday there was "slight progress" during talks with Iran amid uncertainty as to whether a deal will be reached or war will resume.

He spoke days after US President Donald Trump said he was holding off on a military strike on Iran because "serious negotiations" were underway. Trump has been threatening for weeks that the ceasefire reached in mid-April could end if Iran does not make a deal, with shifting parameters for striking such an agreement. Rubio spoke ahead of a meeting of NATO foreign ministers in Helsingborg, Sweden, where the military alliance is expected to discuss what role it could play in helping police the Strait of Hormuz once the war is over.

Rubio said he didn'...