Former New York City Mayor Rudy Giuliani (R) said early Sunday that the presidential election came down to ObamaCare.

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"You know, I actually think it was ObamaCare," Giuliani told George Stephanopoulos on ABC's "This Week" when asked if he thought FBI Director James Comey's letter caused Democratic nominee Hillary ClintonHillary Diane Rodham ClintonRepublicans seem set to win the midterms — unless they defeat themselves Poll: Democracy is under attack, and more violence may be the future Popping the progressive bubble MORE to lose the election. 

"The blue states we were able to turn red — and basically haven't been read since Ronald Reagan — I think ObamaCare was the bigger hit, the fact that those premiums hit on Nov. 1," Giuliani, a top adviser to President-elect Donald TrumpDonald TrumpJan. 6 panel faces double-edged sword with Alex Jones, Roger Stone Trump goes after Woodward, Costa over China Republicans seem set to win the midterms — unless they defeat themselves MORE, said.

Trump broke "the blue wall" in the presidential election, winning several states that traditionally go blue, including Michigan, Pennsylvania and Wisconsin.

A government report released late last month warned that healthcare premiums would increase by an average of 22 percent next year.