Washington: US President Donald Trump reiterated Tuesday that Iran "better be very careful", but did not elaborate whether he was considering taking military action.
His warning came after Tehran said it was breaching part of the nuclear deal it agreed with world powers in 2015.
Trump made the comment during an Oval Office meeting on Tuesday with the Emir of Qatar, Sheikh Tamim bin Hamad Al Thani.
"Well, we'll see what happens with Iran," he said. "Iran is doing a lot of bad things right now and they'd better be very careful."
Iran has said it has decided to enrich uranium beyond the 3.67% limit set out in the accord.
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It is also stockpiling low-enriched uranium beyond agreed limits.
Washington withdrew from the nuclear deal last year.
