Donald Trump, Ted Cruz and Tea Party Republicans came together Wednesday to denounce a landmark foreign policy deal that is quickly becoming a major 2016 campaign issue: the Iran nuclear agreement, USA Today reported.

"We are led by very, very stupid people," Trump told several hundred Tea Party members gathered on the west lawn of the U.S. Capitol, calling the Iran deal "incompetently" negotiated.

Saying Iran will not honor its commitment to forgo nuclear weapons, Cruz told the crowd that the Iran deal represents "the single greatest national security threat facing America."

Cruz, a Texas senator, noted that the deal eliminates economic sanctions on Iran, providing it millions of dollars to finance terrorist activities, and effectively making the Obama administration "the world's largest financier of radical Islamic terrorism."

Both Republican presidential candidates made campaign pitches as part of their anti-agreement speeches.

Trump pledged to negotiate better agreements on a variety of topics, from trade to foreign policy. “We will have so much winning — if I get elected — that you may get bored with winning," the New York businessman said at one point.

For his part, Cruz said "a new president" will confront Iran over its misbehavior.

Obama and aides said the agreement — in which the U.S. and allies reduce sanctions as Iran gives up the means to make nuclear weapons — is the best way to prevent the Tehran regime from obtaining a nuclear arsenal.

White House officials said Cruz and other speakers at the rally are using false arguments to defame the agreement.