Some of the emails Splinter News published Monday featured Joe Ricketts making Islamophobic comments, such as "Islam is a cult and not a religion." Others included conspiracies about former President Barack Obama's birthplace and education.
Joe Ricketts and two of his sons, Pete Ricketts and Todd Ricketts, have long been influential figures in conservative politics. Pete Ricketts, who is the Republican governor of Nebraska, can be seen cautioning his father in some of the emails.
"My father said he deeply regrets and apologizes for some of the exchanges in his emails," Gov. Pete Ricketts said in an email to The Associated Press.