Speaking in a phone interview to New York Post on Friday, he says "we're going to find out in about 24 hours," the paper reports.

"We're loading up the ships with the best weapons ever made, even at a higher level than we use to do a complete decimation.

"And if we don't have a deal, we will be using them and we will be using them very effectively," he adds.

Of the Iranians, he says they are people that you "don't know whether or not they tell the truth".

Talks between the two nations are due to take place on Saturday in Pakistan.