2. It accomplishes pretty much nothing, brings further attention to the fact that the party is in shambles, and draws attention to the fact that key Republican leaders aren't backing Trump. If the intent is to help the nominee, drawing attention to the fact that people aren't backing him doesn't further the goal.
I don't really care about this issue, but I feel someone should point out that this just isn't true. For one thing everyone already knows this, and for another Grassroots Vice Chair Wendy Day is a nobody in their own house.