Republican Reps. Marjorie Taylor Greene and Matt Gaetz backed Ohio GOP Senate candidate J.D. Vance at a rally Saturday, saying Vance is the right person to fight for conservative values and win Ohio's open Senate seat in November.

"J.D. Vance put on a clinic in the debates, in the primaries," Gaetz, R-Fla., told Fox News in an interview before the rally. "Donald Trump saw those debates. He saw the way J.D. was aggressive and assertive, and he had vision and energy. … This is the type of leadership we need. This is the type of leadership that Marjorie and I seek in Washington, D.C."

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Gaetz and Greene, R-Ga., stumped for Vance in front of a rowdy crowd in Newark, Ohio, ahead of Tuesday's GOP primary election. 

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Reps. Matt Gaetz, R-Fla., and Marjorie Taylor Greene, R-Ga., at a rally for Ohio GOP Senate candidate J.D. Vance in Newark, Ohio. (Fox News)

They slammed Democrats for allegedly pushing gender identity lessons in schools, claimed the Centers for Disease Control and Prevention overreached on masks and vaccines and decried RINO (Republican In Name Only) Republicans who they said regularly cave to Democrats and the "corrupt" political establishment. 

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Greene and Gaetz said Vance would be an ally for them in Congress. 

"This is the whole reason why I endorsed JD early on, because I know he's a business guy, he's a family guy. He cares about traditional values that Americans want desperately Congress to care about," Greene said. 

Gaetz and Greene are two of the most controversial members of Congress, often landing in hot water even with GOP leadership over their public comments. But Vance, who's also endorsed by former President Donald Trump, praised them and told Fox News their support should show he won't cave on key issues if elected. 

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Rep. Marjorie Taylor Greene, R-Ga., speaks at a rally for Ohio GOP Senate candidate J.D. Vance (Fox News)

"These two people right here. And I think that sends a signal that I'm not going to stab our voters in the back," Vance said.

Vance's opponents often attack him over the fact he was highly critical of Trump during the 2016 election. That's been the subject of attack ads and letters from GOP activists and officials claiming voters can't trust Vance to be sufficiently pro-Trump. 

Several voters who talked to Fox News Friday at a rally for former Ohio Treasurer Josh Mandel, one of four other major candidates in the primary, said they were disappointed with Trump's endorsement of Vance. One called Vance a "Judas." 

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Vance has acknowledged the comments about the former president and says he's had a genuine change of heart. 

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Ohio GOP Senate candidate J.D. Vance speaks at a rally in Newark, Ohio. (Fox News)

"I just think you have to tell the truth. Right? A lot of people change their mind on Donald Trump, and I'm one of them," Vance said. "A lot of our voters don't mind so long as you're just honest with them."

Multiple voters who spoke to Fox News after the Vance rally Saturday said they were previously undecided on whether they'd support the candidate because of his comments about Trump.

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"After I heard him speak, that was good enough for me," Vickie Boychan told Fox News. "He admitted to saying some of the things that were said on TV and he … admitted to it and was sorry for it and that was enough."

Vance said, "It's not really about what I said about Trump six years ago." 

Gaetz agreed.

"People aren't focused on the past," he said.

Fox News' Mark Meredith contributed to this report.