“I call on President Trump to release the Hoffa files once and for all,” James Hoffa said on the Fox Nation TV series Riddle: The Search for James R. Hoffa with Eric Shawn. The two latest episodes were released on Wednesday.

“Let’s find out what really happened. President Trump, release the files,” James Hoffa added. “I don’t know what’s in those files. That’s why we have to have them released, and the American public, the Teamsters union, the Teamsters union members, our family deserves it, and I think you’ll do it.”

Prior to his disappearance, Jimmy Hoffa had long been connected to the American mob while leading the International Brotherhood of Teamsters. In 1967, he was sentenced to 13 years in prison after being convicted of jury tampering, fraud, and using pension funds to pay mobsters in exchange for kickbacks. His sentence was commuted by former President Richard Nixon in 1971, but he was unable to return to the labor union he had led for 14 years.

Jimmy Hoffa tried to regain control of the Teamsters until his disappearance. His son believes the two may be connected.

“A lot of people didn’t want him to come back because he was going to straighten the union out,” James Hoffa recently told Fox 2 Detroit reporter Taryn Asher. “He had been gone for a while, and he wanted the union to be what it should be. And they didn’t want him coming back, and that was what was behind his disappearance.”

Jimmy Hoffa is believed to have been murdered by the mob. He was last seen standing outside a Detroit restaurant where he was set to meet two mobsters, who apparently never showed up. Police found his abandoned 1974 Pontiac in a nearby parking lot. Seven years later, he was declared dead by a judge despite his body never being found.

The FBI has been investigating the case for years and has released thousands of pages of related documents. However, James Hoffa noted that much of the information is redacted.

“They say it’s still an ongoing case, and when you get the material from the FBI, it’s all redacted, you can’t read it,” he said on the Fox series.

The FBI has repeatedly said its investigation of the case remains open and that releasing the classified material could be compromising.

In recent months, the Trump administration has released troves of newly declassified documents pertaining to the 1960s assassinations of former President John F. Kennedy, former Attorney General Robert F. Kennedy, and Civil Rights leader Martin Luther King Jr. The releases came after Trump ordered Director of National Intelligence Tulsi Gabbard to declassify the files in January.

The Trump administration has been less transparent about the files on the late sex trafficker Jeffrey Epstein. Attorney General Pam Bondi and the FBI released a “first phase” of the Epstein files in February, handing out binders to right-wing influencers. The move was widely criticized by conservatives, partly because many of the files were already publicly available or previously leaked.

Earlier this month, the Department of Justice concluded Epstein’s “client list” didn’t exist and that the financier committed suicide while imprisoned in 2019. Epstein died before he could go to trial. The DOJ has since moved to rectify the political fallout from that conclusion by asking federal judges to release grand jury transcripts in the convictions of Epstein and his co-conspirator Ghislaine Maxwell.

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Maxwell, who was granted limited immunity to answer questions, met with the DOJ last week. She is also expected to testify before the House Oversight Committee next month. On Monday, Maxwell asked the Supreme Court to throw out her conviction for sex trafficking minors as speculation of a possible pardon mounts.

Trump said he’s “allowed” to pardon Maxwell but stipulated that it would be “inappropriate” to discuss the topic at this time.