() Oscar-winning director Oliver Stone tells that investigating President John F. Kennedy’s assassination requires persistence despite the absence of a “smoking gun.”

“You got to build up the case. It’s a cold case with a lot of clues,” Stone said Tuesday on ‘s “CUOMO” after he testified in Congress before a task force on declassification of federal secrets regarding the JFK files.

The hearing focused on the continued withholding of key documents related to the assassination despite the Trump administration’s recent release of 80,000 unredacted pages.

Stone urged Congress to reopen the investigation.

“I ask the committee to reopen what the Warren Commission failed miserably to complete,” Stone said during the hearing. “I ask you, in good faith, outside all political considerations, to reinvestigate the assassination of this President Kennedy from the scene of the crime to the courtroom.”

Stone, who directed the 1991 film “JFK” and the more recent 2021 documentary “JFK Revisited,” appeared on alongside his production partner James DiEugenio, who has authored four books on the assassination.

Information about the assassinaion was “concealed because they didn’t want to show the evidence that (presumed assassin Lee Harvey) Oswald could not have produced a shot like that,” DiEugenio said.

The filmmakers also questioned Oswald’s movements immediately after the shooting, citing testimony from women working in the Texas School Book Depository who saw colleagues rush downstairs within 40 seconds of the shooting.

“How the hell does he get ahead of everybody and run down, stash the rifle, run down the stairs, do everything and appear in the second floor lunch room in less than a minute and a half?” Stone asked.

DiEugenio called for complete declassification of documents related to Oswald’s activities in Mexico City and New Orleans in 1963, and urged the committee to interview surviving members of the Warren Commission, House Select Committee and Assassination Records Review Board.