“... McConnell has to abide by the rules of the senate ...”
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The senate sets its “rules” by a simple majority vote.
For instance, remember all the people on this site that believed Ryan would not be Speaker and McConnell would not be Majority Leader because Trump will do something. Well, I'm still waiting for that something. Well, we know those two will be the leaders for the next two years. I still see posts from some people who still believe they will be denied. They don't realize the caucus votes have already been taken. I guess they will be in for a shock in a few days when it is made official.