Even that's wrong though! The Republican party getting clobbered doesn't lead to a one party system. The US isn't designed for a one party system! Either the Republican party would have to reform or there would be a different 2nd viable party that rises to power.
Even if you take his statements with the most generous interpretations possible he's still spouting bullshit.
Huh? Having no opposition in government for an election cycle or two isn't magically prevented. This makes no sense. Remember what I said about arguments that have to constantly change and becomes less and less?