The success of the G.O.P. push to keep the majority suggests that it paid no political price for the chaos and paralysis of its past two years in control of the House.
The three-term senator from Florida viciously criticized Donald J. Trump during the 2016 campaign but has since ingratiated himself and become a foreign policy adviser to Mr. Trump.
The president-elect is to visit Capitol Hill on Wednesday as Republican senators elect a majority leader. His staffing decisions are already depleting the narrow majority the G.O.P. expects in the House.
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