Washington (CNN) President Donald Trump says the United States is putting additional sanctions on Iran and that he would support a course of action to "make Iran great again" should Tehran agree to a nuclear weapons ban.

"We're putting additional sanctions on, they're going on slowly and, in some cases, pretty rapidly, but additional sanctions are being put on Iran," the President told reporters on the South Lawn Saturday before departing to Camp David.

"Some of them are already in place," he added, though he didn't elaborate further on the details of the sanctions.

In a tweet later Saturday, Trump specified, "We are putting major additional Sanctions on Iran on Monday."

He told reporters Saturday that he believes further sanctions will drive Iran to the bargaining table with the United States, calling Iran an "economic mess" that is "going through hell."

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