President Donald Trump attends the United States Coast Guard Academy's graduation ceremony in New London, Connecticut on Wednesday. UPI-Yonhap

NEW LONDON, Connecticut — President Donald Trump said on Wednesday that the United States may have to attack Iran even harder but will wait and see if a deal is reached, reprising the "either/or" rhetoric he has used since announcing a ceasefire six weeks ago.

"We'll see what happens," Trump said during a commencement address at the U.S. Coast Guard Academy. "We hit them very hard. We may have to hit them even harder - but maybe not."

"We will not let Iran have a nuclear weapon. It's very simple," Trump told the cadets.

He said Iran's military might is largely gone and the only question is whether the U.S. goes back to finish the job or will Iran sign a deal.