Trump explains it perfectly why not to attend.
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“How many times can the same people ask the same questions.”
Trump isn't backing out because he's sick of talking--he talks about the same stuff every day on the stump. I don't disagree with the fact that the debates are getting kind of tedious, but each time the field narrows, it gives the candidates more time to actually explain their positions. There was actually some new stuff at the last debate--on social security, for example. I don't like the questions Fox asks--they feed on drama--so I'll probably skip it, anyway.