Trump endorsed Ryan. In the primary, and more than once.
Ryan was perhaps slightly less liberal then other RINOs. That’s not saying much.
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DeSantis voted for Ryan twice for House Speaker when he was a Congressman.
Just going with the flow.
Ryan was he compromise choice, if you recall. He was used to stop a more liberal candidate.
Add to that DeSantis said, "I could be somebody like Paul Ryan".
Add to that, Paul Ryan has said that DeSantis is on his short list for the nomination.
Add to that, Paul Ryan is board member of the Fox, a "news" network that wants to make Trump "a nonperson".
Add to that Paul Ryan says that Trump will not win the nomination.
And I could go on and say similar things about Karl Rove and the Bushes wanting and pushing DeSantis.