Hot dog vendors serve hot dogs to U.S. congressional members and staffers at the Rayburn House Office Building on Capitol Hill in Washington D.C., the United States, on July 17, 2019. The event was held here on Wednesday in celebration of the National Hot Dog Day. (Xinhua/Ting Shen)

A vendor prepares a hot dog during the annual Hot Dog Lunch event at the Rayburn House Office Building on Capitol Hill in Washington D.C., the United States, on July 17, 2019. The event was held here on Wednesday in celebration of the National Hot Dog Day. (Xinhua/Ting Shen)

People eat hot dogs during the annual Hot Dog Lunch event at the Rayburn House Office Building on Capitol Hill in Washington D.C., the United States, on July 17, 2019. The event was held here on Wednesday in celebration of the National Hot Dog Day. (Xinhua/Ting Shen)

A hot dog is seen during the annual Hot Dog Lunch event at the Rayburn House Office Building on Capitol Hill in Washington D.C., the United States, on July 17, 2019. The event was held here on Wednesday in celebration of the National Hot Dog Day. (Xinhua/Ting Shen)

A man eats a hot dog during the annual Hot Dog Lunch event at the Rayburn House Office Building on Capitol Hill in Washington D.C., the United States, on July 17, 2019. The event was held here on Wednesday in celebration of the National Hot Dog Day. (Xinhua/Ting Shen)

People eat hot dogs during the annual Hot Dog Lunch event at the Rayburn House Office Building on Capitol Hill in Washington D.C., the United States, on July 17, 2019. The event was held here on Wednesday in celebration of the National Hot Dog Day. (Xinhua/Ting Shen)