Regardless of which candidate wins the White House on Tuesday, the U.S. will be in for a "long, difficult couple of years," former Speaker Newt Gingrich (R-Ga.) said Sunday. 

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A Hillary ClintonHillary Diane Rodham ClintonRepublican Ohio Senate candidate slams JD Vance over previous Trump comments Budowsky: Why GOP donors flock to Manchin and Sinema Countering the ongoing Republican delusion MORE presidency would be full of criminal investigations, the Republican said on NBC's "Meet the Press," while Donald TrumpDonald TrumpGOP grapples with chaotic Senate primary in Pennsylvania ​​Trump social media startup receives commitment of billion from unidentified 'diverse group' of investors Iran thinks it has the upper hand in Vienna — here's why it doesn't MORE's presidency would be a continuous fight over who controls the country. 

"if Hillary is elected, the criminal investigations will be endless, and if Trump is elected, it will just be like Madison, Wis., with Scott Walker. The opposition of the government employee unions will be so hostile and so direct and so immediate, there will be a continuing fight over who controls the country," said Gingrich, a supporter of the Republican presidential nominee.

"I think that we are in for a long, difficult couple of years, maybe a decade or more, because the gap between those of us who are deeply offended by the dishonesty and the corruption and the total lack of honesty in the Clinton team."