Donald TrumpDonald TrumpWhite House denies pausing military aid package to Ukraine Poll: 30 percent of GOP voters believe Trump will 'likely' be reinstated this year Black Secret Service agent told Trump it was offensive to hold rally in Tulsa on Juneteenth: report MORE rallied opponents of the Iran nuclear deal at the Capitol on Wednesday, slamming President Obama’s diplomatic pact as an embarrassment to the country.

“We are led by very, very stupid people,” Trump told a crowd gathered on the Capitol’s west lawn.

“We are going to get nothing,” he said of the nuclear deal. “They rip us off, they take our money, they make us look like fools.”

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Trump, who has become the front-runner in the GOP race for the White House, said the United States bungled the negotiations over the Iran pact, which will lift sanctions on Iran’s economy in exchange for limits on its nuclear program.

“Never, ever in my lifetime have I seen a transaction negotiated so incompetently,” he said.

“We will have so much winning if I get elected you’ll get bored of winning,” the business mogul added. “We are going to start winning big league.”

Trump wasn't the only presidential contender on hand for the rally. He was preceded onstage by Sen. Ted CruzRafael (Ted) Edward CruzWhite House denies pausing military aid package to Ukraine Ted Cruz says critical race theory is as racist as 'Klansmen in white sheets' Pentagon pulling 'certain forces and capabilities,' including air defenses, from Middle East MORE (R-Texas), a rival for the 2016 nomination who has at times defended Trump from criticism.

Cruz told the crowd that the nuclear pact will endanger Israel and increase the risk of terrorism around the globe.

“We are now talking about giving Ayatollah Khamenei $100 billion to carry out his murderous plans,” Cruz said of Iran’s supreme leader.

“You cannot wash your hands of that blood,” Cruz said of Iran deal supporters in Congress. “If this deal goes through, we know with absolute certainty that people will die.”

The energetic rally on the west lawn of the Capitol, which was attended by Glenn Beck, Sarah Palin and several Republicans in Congress, comes amid a growing fight in the House over the next steps in the fight against Obama’s nuclear pact.

Conservatives in the House are demanding that the Obama administration send the text of side deals between Iran and international nuclear inspectors to Congress. Without the information, the conservatives argue, the clock for congressional consideration of the deal hasn’t begun.

House GOP leaders had planned to hold a procedural vote Wednesday to open debate on the Iran resolution, but that vote has now been pushed back.

The Senate, meanwhile, is preparing to vote this week on a resolution disapproving of the Iran deal, which Democrats are expected to block.

Cruz echoed the call for delaying the Iran votes on Wednesday, arguing that Republican leaders are the only thing standing in the way of Obama's "catastrophic deal."

Mitch McConnellAddison (Mitch) Mitchell McConnellGraham quips key to working with Trump: We both 'like him' The Hill's Morning Report - ObamaCare here to stay Democrats scramble to unify before election bill brawl MORE and John BoehnerJohn Andrew BoehnerAre maskless House members scofflaws? Israel, Democrats and the problem of the Middle East Joe Crowley to register as lobbyist for recording artists MORE can stop this deal if they simply enforce federal law,” Cruz said, referring to the Senate leader and Speaker.

“If Republican leadership decides that a show vote is more important than stopping this deal, then the single most important issue in 2016 is stopping Iran from acquiring Iran from getting a nuclear weapon. This Iranian deal is catastrophic.”

— This story was updated at 2:26 p.m.