Former NBA referees Kenny Mauer and Jason Phillips claim the league's "high standard" of proof required to receive a COVID-19 vaccine exemption violated their religious liberty. 

The pair is now taking their grievances to court after the league rejected their requests for exemptions from the vaccine mandate.

"We took part in a 30-minute interview. A lawyer in the NBA office interviewed us and then went back to the NBA management, and then they came to the conclusion that I wasn't a religious person, I guess," Mauer said Monday on "Fox & Friends First."

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Mauer, who has been a practicing Catholic since being baptized nearly 60 years ago, said, despite the firing, his faith has never changed and never will.

"[Neither] the NBA nor any human being nor any person in the world is going to change how I feel about our lord Jesus Christ and how I feel about my faith, my religion…" he said.

Phillips said his own request for an exemption was met similarly when the league rejected his "sincere" application.

"[I] submitted a religious exemption that was definitely sincere and then, after an interview on my own also, the NBA came to the conclusion after quite some time that it was not sincere…" he told Todd Piro.

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Attorney Sheldon Karasik, who will represent Phillips, Mauer and former referee Mark Ayotte, said the NBA used a "Pinocchio test" to determine whether exemption requests were valid.

"When they were interviewing my clients and all the others for a 30-minute period of time, when my clients and others who are not allowed to be represented by counsel, I guess their nose[s] grew several inches like Pinocchio's and, lo and behold, they found that they weren't being sincere and truthful," he said.

"It's a sham exemption. It's not a real exemption. They granted none based upon parsing through statements over a long period of time…"

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Ken Mauer in 2017

NBA referee Ken Mauer at American Airlines Center on October 18, 2017 in Dallas, Texas. (Ronald Martinez/Getty Images)

He claimed that the league took a number of requests "out of context," jumping to conclusions that some applicants were lying about their religious beliefs.

"It's an absurdity," he said.

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Reuters reported that the plaintiffs filed a lawsuit against the league in the U.S. District Court, Southern District of New York on Saturday.

The former referees said that, despite the NBA lifting the exemption requirement for the season, they were never reinstated.

Fox News' Ryan Gaydos contributed to this report.