Republicans will openly, unashamedly say that 712,000 D.C. residents can’t have representation in Congress because it would endanger their power. That’s it. Nothing else to say.
If the impeachment managers hope to win this persuasion argument, they must speak to how Republican senators can stay in power – or recover their lost power – or protect themselves from the loss of power. They need to demonstrate that the actions of the defendant threaten the ruling authority of these Republican senators.