GOP Sen. Dan Sullivan is raising alarms about an 11th hour challenger: Dan J. Sullivan

By Manu Raju, Aleena Fayaz, CNN (CNN) — It was three days before the filing deadline when Alaska Sen. Dan Sullivan learned of an eleventh-hour Republican challenger in his high-stakes reelection race. The challenger’s name: Dan J. Sullivan. Sen. Sullivan says it’s not a joke. The two-term Republican incumbent, and the GOP’s Senate campaign arm,