Ohio Secretary of State Jon Husted and his spokesman, Joshua Eck, have already decided that due to the fact Trump "voluntarily participated" in the Republican primary debate in the state of Ohio, he's already declared himself a Republican in the eyes of Ohio law and "chosen a party for this election cycle."
So, if I decide that I, as a registered Republican, want to vote for a DEM in the election, I’m not allowed to? They are making up the rules as they go.