David @davidgregory
This may explain why Romney doesn't want to endorse anyone. https://t.co/DI9aClf3hq — PolitiTweet.org
CNN @CNN
First on CNN: Team @MittRomney explores blocking @realDonaldTrump at RNC https://t.co/nP80Sv3kQa https://t.co/vhIivUm8uY