"He has to understand that there exist some audiences that should not be addressed as part of his base, because they are not," said Mark Hertling, a retired three-star Army lieutenant general. "It's a violation of protocol by the president."

"He has to understand that there exist some audiences that should not be addressed as part of his base, because they are not," said Mark Hertling, a retired three-star Army lieutenant general. "It's a violation of protocol by the president." https://t.co/UH4ttlxykk

— Kyle Griffin (@kylegriffin1) December 28, 2018