Washington -- U.S. President Donald Trump said on Monday the United States could support another major strike on Iran were it to resume rebuilding its ballistic missile or nuclear weapons programs and warned Hamas of severe consequences if it does not disarm.

Speaking beside Israeli Prime Minister Benjamin Netanyahu following a meeting at his Mar-a-Lago estate in Florida, Trump suggested Tehran may be working to restore its weapons programs after a massive U.S. strike in June.

"I've been reading that they're building up weapons and other things, and if they are, they're not using the sites we obliterated, but possibly different sites," Trump told reporters during a press conference.

"We know exactly where they're going, what they're doing, and I hope they're not doing it because we don't want to waste fuel on a B-2,” he added, referring to the bomber used in the earlier strike. "It's a 37-hour trip both ways. I don't want to waste a lot of fuel."

Trump, who has broached a potential nuclear deal with Tehran in recent months, said his talks with Netanyahu focused on advancing the fragile Gaza peace deal he brokered and addressing Israeli concerns over Iran and over Hezbollah in Lebanon.