What a ridiculous statement to make. Any "supporter" who would abandon President Trump over this tactical decision was never a supporter in the first place. President Trump is in a much better position to see things that we cannot, and to take actions that are also hidden from public view. He has the best performance track record of any president in our lifetimes, so I'm willing to trust his judgment on timing, venue and surrounding circumstances of this year's State of The Union address.
If the Republican Party actually had Trump’s back for once, this probably wouldn’t have happened.