In Adam Kinzinger's new book, he recounts some key moments from the 2016 GOP presidential primaries. Kinzinger backed Florida Sen. Marco Rubio after former Florida Gov. He said he should've been "worried" at how easy it was to text with Rubio about the endorsement. AdvertisementAdvertisementAs the 2016 Republican presidential field took shape, then-Rep. Adam Kinzinger made the decision early-on to get behind former two-term Florida Gov. Trump's campaign continued to gain steam, and by the time the GOP primary reached Florida, Rubio had not been to blunt the New York businessman's momentum.

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