A growing chorus of Republicans from across the country are telling Americans that the voting system is secure, despite Donald Trump’s unsubstantiated claims of a “rigged” election.

“Look, to say that elections are rigged and all these votes are stolen, that’s like saying we never landed on the moon, frankly,” Ohio Gov. John Kasich told “CBS This Morning” on Wednesday. “That’s how silly it is.”

The governor fears that a sizable portion of voters might not accept the legitimacy of America’s next president due to Trump’s claims.

Trump has consistently promoted fears of “rigged” results whenever he’s trailed in the polls — though he ceased those claims when he was ahead or within striking distance. Hillary Clinton has widened a substantial lead in national and state surveys since Trump’s campaign imploded during the first debate. The third and final debate is Wednesday night.

“The problem is it does create doubt in people’s minds and I worry about the 25 percent of Americans who may say, when this election’s over, that it was stolen,” Kasich added.

Earlier this week, Sen. Marco Rubio (R-Fla.) said there’s “no evidence” that dark forces are out to steal next month’s election.

“This election is not being rigged,” Rubio said during a debate Monday. “There is no evidence behind any of this, so this should not continue to be said.”

In New Jersey, Assembly Minority Leader Jon Bramnick (R-Union) said he completely disagreed with Trump’s conspiracy theory.

“It’s a very dangerous path to go down,” Bramnick said. “The most important thing is our belief in our institutions. We may disagree with each other on policy, but we don’t believe the institutions themselves are corrupt or rigged.”

Trump supporter Jon Husted, the Republican secretary of state in battleground Ohio, told NPR on Monday that the candidate should cease his claims and that the American voting system is safe and reliable.

“The supposed widespread voter fraud is not a reality,” Michael Waldman, executive director of the Brennan Center for Justice at the NYU School of Law, told CNN’s “New Day” on Wednesday.