Former GOP Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (Wis.) said Friday he disagrees with Sen. Mitt Romney Willard (Mitt) Mitt RomneySenate Republicans face tough decision on replacing Ginsburg McConnell says Trump nominee to replace Ginsburg will get Senate vote GOP-led panel to hear from former official who said Burisma was not a factor in US policy MORE's (R-Utah) decision to vote for President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE's removal from office in this month's impeachment trial.

It was “purely a conscience vote” for Romney, Ryan said at an event at the University of Virginia, according to the Milwaukee Journal Sentinel.

Ryan was Romney's running mate when he ran for president as the Republican nominee in 2012.

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Romney, who was the only Republican to vote to convict Trump on either of two articles of impeachment, said prior to his vote that Trump had demonstrated an "appalling abuse of public trust" in his dealings with Ukraine.

Ryan criticized Trump's rhetoric and said he knew little about governing in Tim Alberta's book “American Carnage" last year, but said Friday that he believes the president will be reelected in November because of the current “dream” economy.

He said he believes the impeachment trial "actually helped the president," and predicted that the possibility that Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.) becomes the Democratic nominee could also help Trump's reelection effort.

“As a Republican … I love the idea of a Sanders candidacy," Ryan said. "It gets me excited about the down-ballot. I feel like we’d have a pretty good shot at the House [and] pad our majority in the Senate."

Trump has criticized Ryan in the past, including ripping his "atrocious" record and blaming him — as a board member — for negative coverage on Fox News. Ryan, however, dismissed Trump's criticism.

“It is what it is. I sort of shrug my shoulders, move on," he said Friday. "Let it roll off your back.”