WATCH: Donald Trump: Israel Was Sold Out by Obama, Kerry

Speaking at Iowa campaign event, Republican frontrunner says he would take a tougher stance on Iran, saying 'you cannot let Iran have a nuclear weapon.'

Republican presidential candidate and real estate mogul Donald Trump said President Obama and Secretary of State John Kerry hurt Israel through the recent agreement on Iran’s nuclear program.

“Israel was sold out by Kerry and Obama,” Trump said at an Iowa campaign event Saturday. “You cannot let Iran have a nuclear weapon. You can’t have it. When they march down the street saying ‘Death to Israel. Death to the United States.’ You can’t let that happen.”

Trump seemed to imply he would take a tougher stance on Iran, pointing to himself and saying, “Believe me, it will not happen here.”

Trump is a vocal supporter of Israel, and a harsh critic of President Obama’s policy toward Israel.

“I have many Jewish friends that support Obama and I say, ‘Why?’ and they can’t explain why. They support him, they give him money, they give him campaign contributions,” Trump told radio host Michael Savage in February. “This is the worst enemy of Israel.”