Washington, Feb. 5 -- U.S. President Donald Trump took an executive action Tuesday to restore the so-called "maximum pressure" campaign on Iran aimed at preventing the Islamic Republic from obtaining nuclear weapon.

Speaking to reporters in the Oval Office as he was signing the document -- of which the exact content and form the White House has yet to make public -- Trump said he took the action somewhat hesitantly, adding that he hoped the measure would lead to a negotiated deal with Tehran.

"So this is one that I'm torn about. Everybody wants me to sign it. I'll do that. It's very tough on Iran," Trump said. "We will see whether or not we can arrange or work out a deal with Iran."

"So I'm signing this and I'm unhappy to do it, but I...