Is the GOP Donald Trump's rival?

Republican front-runner Donald Trump has made controversial comments since he decided to run for president last June. From wavering on disavowing David Duke to a battle with the pope, Trump has shaken up the GOP and groups of voters around the country. Will he damage the party more if he wins the Republican nomination? To break down the GOP race, Face The Nation Moderator John Dickerson joins CBSN in New York.