LAS VEGAS -- Hundreds of protesters greeted Republican vice presidential candidate Paul Ryan outside Las Vegas' Venetian hotel as the Wisconsin congressman prepared for a private meeting with Republican mega-donor Sheldon Adelson.

Labor unions organized the protest Tuesday night. Workers chanted "Ryan, go home" and waved signs warning that the Republican presidential ticket is the "road to ruin."

Ryan was inside the hotel for what the Mitt Romney campaign described as a "finance meeting." The campaign barred reporters from attending the event.

Democrats are attacking Ryan's proposals to reshape Medicare and cut trillions from federal programs.

The Republican congressman spoke at a Las Vegas rally earlier in the day, criticizing President Barack Obama's leadership. He didn't mention his plans to overhaul Medicare.

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    US Republican presidential candidate and former Massachusetts Governor Mitt Romney (L) shakes hands with his running mate Wisconsin Representative Paul Ryan in front of the campaign bus prior to each boarding their own campaign airplanes at General Mitchell Airport in Milwaukee, Wisconsin, August 12, 2012. (Photo credit should read SAUL LOEB/AFP/GettyImages)

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    WAUKESHA, WI - AUGUST 12: Republican presidential candidate and former Massachusetts Gov. Mitt Romney and vice presidential candidate and Wisconsin native Rep. Paul Ryan (R-WI) (L) hug after speaking at a campaign event at the Waukesha Expo Center on August 12, 2012 in Waukesha, Wisconsin. (Photo by Darren Hauck/Getty Images)

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    WAUKESHA, WI - AUGUST 12: Republican presidential candidate and former Massachusetts Gov. Mitt Romney and vice presidential candidate and Wisconsin native Rep. Paul Ryan (R-WI) (L) greet supporters during a campaign event at the Waukesha Expo Center on August 12, 2012 in Waukesha, Wisconsin. (Photo by Darren Hauck/Getty Images)

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    Republican presidential candidate, former Massachusetts Gov. Mitt Romney, right, and vice presidential running mate Rep. Paul Ryan R-Wis. are joined by Ronmey's granddaughter Chloe while talking to reporters on the charter flight between Virginia and North Carolina, Saturday, Aug. 11, 2012. (AP Photo/Mary Altaffer)

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    WAUKESHA, WI - AUGUST 12: Republican vice presidential candidate and Wisconsin native Rep. Paul Ryan (R-WI) (L) wipes away tears as he and presidential candidate and former Massachusetts Gov. Mitt Romney greet supporters during a campaign event at the Waukesha Expo Center on August 12, 2012 in Waukesha, Wisconsin. (Photo by Darren Hauck/Getty Images)