Presumptive Republican presidential nominee Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE thought the crowd at Sunday's Rolling Thunder rally would resemble Martin Luther King’s “I Have a Dream” speech.

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“I thought this would be like Dr. Martin Luther King where people were lined up from here all the way to the Washington Monument,” Trump said Sunday at the annual Rolling Thunder rally, where thousands of motorcyclists honor U.S. prisoners of war and missing-in-action troops.

The billionaire claimed that more than half a million people attempted to attend his speech, “but unfortunately they aren’t allowed to come in.”

Trump seemed caught off guard by the size of the crowd, according to Bloomberg Politics. He suggested that many had been prevented from attending, without offering any evidence, Bloomberg noted.

"We have the biggest rallies by far, far bigger than Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE," he told a crowd in front of the Lincoln Memorial, according to CBS. "Far bigger. I mean, look at today. They say you have 600,000 people here trying to get in."

"That's not gonna happen," he added. "But they say you have 600,000 people."

CBS News reported that a crowd count was unavailable, but the space in front of the Lincoln Memorial was far from full.

About 250,000 people watched as King delivered his "I Have a Dream" speech from the steps of the memorial in 1963.