The nation’s top conservative donors will gather this weekend in Colorado Springs as part of a political retreat hosted by Charles and David Koch that will draw top Republican leaders.

The biannual Freedom Partners seminar starts Saturday at The Broadmoor, a day after Republican presidential nominee Donald Trump attends a fundraiser and campaign event miles down the road at the University of Colorado at Colorado Springs. The three-day conference is expected to draw several hundred people from across the country.

Colorado Sen. Cory Gardner is confirmed to attend part of the event, according to a spokesman. Republican U.S. Senate candidate Darryl Glenn, who lives in Colorado Springs, is not attending, his campaign said.

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David Koch and his brother Charles will host conservatives at The Broadmoor this weekend. (AP file)