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DENVER -- Frustration over how Colorado conducted its GOP delegate selection process reached a boil Friday, with hundreds of Donald Trump supporters rallying at the State Capitol.

Texas Sen. Ted Cruz swept all of Colorado's delegates at congressional district gatherings and the state convention.

"It's not over," Jim Baker, a former Trump campaign staffer in the state, told the crowd. "We demand that every Colorado delegate be thrown out of the convention because they are Trojan horse delegates and they don't belong."

Baker said he hopes the Trump campaign formally challenges the credentials of Colorado's delegates if the Cleveland convention is contested. Baker also called for an emergency election in the state.

The crowd gathered at the State Capitol was far smaller than the "thousands" organizers predicted Thursday, but many came with signs.

Police officers remained on standby throughout the afternoon as supporters gave impromptu speeches on the Capitol steps.

While the Capitol rally took place, supporters of the Colorado GOP gathered outside State Party headquarters in Greenwood Village to show support.

Some of Colorado's Republicans have received death threats in recent days.

"We are concerned about that because when you are exercising your political rights you should be able to do so without threats or intimidation," organizer Jimmy Sengenberger said.