Ohio Republican congressional candidate Marisha Agana put President Barack Obama in the company of Adolf Hitler, Joseph Stalin and Mao Zedong in a tweet on Sunday.
"History has a way of repeating itself: Stalin, Hitler, Mao Tse Tung and now Obama!!!" Agana wrote.
"You need to immediately apologize for comparing the President of the United States to Hitler. This is not how a person running for office behaves in this country. When you make these types of comments, you diminish the suffering of the Jewish people."
Agana is running against Tim Ryan in Ohio's 13th Congressional District.