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An Arizona Congressional candidate who is opposed to the country's immigration policies described the fear he saw on the faces of Central American migrant children in custody - and tweeted out a photo of kids on a bus headed for a YMCA camp.

Adam Kwasman, a Republican state legislator running to represent Arizona's 1st Congressional district, tweeted a photo of a yellow school bus while attending a protest outside of Tucson, with the caption, "Bus coming in. This is not compassion. This is the abrogation of the rule of law."

@AdamKwasman/Twitter via Politwoops

"I was able to actually see some of the children in the buses, and the fear on their faces … This is not compassion," Kwasman told the Arizona Republic.

Turns out the children were not migrants, but campers headed to the YMCA's Triangle Y Ranch Camp, which offers horseback riding, archery, and rock climbing, among other activities.

The buses of immigrant children never showed up, according to the Arizona Republic.

When informed of the mix-up by a reporter, Kwasman said the campers "were sad too" before apologizing.

"OK, I apologize, I'm sorry. I didn't know. I was leaving when I saw the school bus," Kwasman said.

He later deleted his tweet-which was archived by the Sunlight Foundation-and apologized on social media.

Last tweet not the bus of illegal immigrant children. Thank God.

- Adam Kwasman (@AdamKwasman) July 15, 2014

I apologize for the confusion. That was my error

- Adam Kwasman (@AdamKwasman) July 15, 2014

Kwasman, a tea party candidate, will face former Arizona House Majority Leader Andy Tobin and businessman Gary Kiehne in the July 28 Republican primary for Arizona's first congressional district. The winner will challenge Democratic incumbent Rep. Ann Kirkpatrick.