Maldonado said he asked Carnahan's office if his citizenship documentation would be public record and available to anyone who wants a copy.
"They said, oh yes, absolutely, anyone that wants proof, we have it," he explained. "I said, OK, can you do me a favor then? I'm sure Ms. Carnahan requested the same of Barack Obama when he petitioned to get on the Missouri ballot to become president."
He added, "They had no response. They had nothing."
"But I decided something different. I'm actually considering suing Ms. Robin Carnahan because she discriminated against me," he said.
In an earlier interview on the subject, Maldonado said he spoke with other candidates running for the same office and asked if they had to show proof of citizenship or prove that they were citizens.
"They said no. I was the only one," he said.