President Donald Trump said U.S. strikes against Iran will intensify in the coming days unless Tehran returns to the negotiating table.

"We're going to hit them very hard tonight. We're going to hit them very hard tomorrow night. We're going to hit them very hard the night after," Trump said in an exclusive interview with Fox News chief foreign correspondent Trey Yingst.

Trump continued, "And then next week it gets really bad for them because next week comes the power plants. Next week comes the bridges. We're going to knock out all the power plants. We're going to knock out all their bridges unless they get to the table and negotiate."