Masters is challenging incumbent Democratic Senator Mark Kelly. While polling shows that Kelly has a lead over Masters, the Democrat’s advantage has narrowed in recent weeks.

“NEW: Chuck Norris endorses Blake Masters for U.S. Senate in Arizona,” a campaign account for Masters tweeted on Friday.

The account retweeted another post about the endorsement, writing: “Chuck Norris knows the results in Arizona before Fox News.”

In an article he wrote on WND.com and posted on his official Facebook Page, Norris included Masters on his list of “Chuck Norris-approved candidates.”

“Blake Masters, U.S. Senate candidate for Arizona, has far better leadership credentials and skills than his political opponent to help all Arizonians,” he wrote.

According to a polling average in the Senate race compiled by FiveThirtyEight, Kelly is ahead by two points—leading Masters 48.1 percent to 46.1 percent.

But a poll from Emerson College released Friday found Masters with the support of 48 percent of voters, and Kelly with the backing of 47 percent.

In his post on WND.com, Norris criticizes the Biden administration over its border policies, writing that the “crisis at the U.S. southern border couldn’t be any worse.”

“The Biden administration’s open-border policies have allowed a total of roughly 5,500,000 illegals to cross over into the United States, which is the equivalent number of people in entire countries like Ireland, New Zealand and Costa Rica,” Norris wrote.

Later in the post, he said the candidates he is backing “are strong advocates for securing U.S. borders.” In addition to Masters, that list includes Adam Laxalt, the GOP Senate candidate in Nevada; Herschel Walker, the Republican Senate candidate in Georgia; and Mehmet Oz, the Republican Senate candidate in Pennsylvania.

Newsweek has reached out to the Masters and Kelly campaigns for comment.

Masters has also been endorsed by former President Donald Trump. As of late October, a political action committee backed by Trump had poured nearly $3 million into the Arizona Senate race to support the Republican candidate.

A week ahead of the November 8 midterm elections, the libertarian in the Arizona Senate race, Marc Victor, dropped out and endorsed Masters.

“I certainly think it’s good news for Blake Masters. In a race that seems to be this tight, anything can help,” Christopher Devine, an assistant professor of political science at the University of Dayton, said in an interview with Newsweek at the time, reacting to the development. But Devine also noted that Victor hadn’t gained much support from voters before he dropped out.

Update 11/4/2022, 3:45 p.m. ET: This article has been updated with additional information.