(Reuters) - An Arizona congressional candidate at a protest mistook a busload of YMCA campers for undocumented immigrant children on Tuesday, according to a report on The Arizona Republic website, azcentral.com.

Adam Kwasman, a Republican state representative who favors stronger border controls, had joined a group of people in the town of Oracle protesting the expected arrival of migrant children, according to a report on The Arizona Republic website, azcentral.com.

Kwasman tweeted from the scene "Bus coming in. This is not compassion. This is the abrogation of the rule of law," according to the website. Told by a reporter that the children on the yellow school bus were actually YMCA campers, Kwasman said, "They were sad, too," and admitted he made a mistake. He deleted his tweet, which can be found on Politwoops, a website that features U.S. politicians' deleted tweets.