The agents wanted to clear up uncertainties about McVeigh's whereabouts on specific dates that were left unanswered by his public statements and the evidence, essentially filling in gaps in his timeline before the bombing, the officials told The Associated Press.
The plan was scrapped when the government couldn't resolve who would attend the interview or how it would be conducted. Officials also became distracted by the belated discovery of some 4,000 pages of documents that had not been turned over to McVeigh's defense during his trial.
That discovery prompted a one-month delay in McVeigh's execution, during which FBI and Treasury agents continued to press unsuccessfully for access to McVeigh on death row.
The interview debate was described by several current and former officials. They said it showed the government didn't know everything it wanted about McVeigh before he was put to death.
McVeigh's massive fertilizer bomb killed more than 160 people at the Alfred P. Murrah building in Oklahoma City on April 19, 1995.
In the latest revelations, the officials said the potential last-minute interview with McVeigh became a primary focus of the remaining McVeigh investigative team during the spring of 2001 and was the subject of a high-level meeting in Oklahoma City in March of that year.
The officials said the debate was documented in numerous FBI e-mails, and they were uncertain whether those e-mails should have been turned over to lawyers for the upcoming Oklahoma state murder trial of Terry Nichols, McVeigh's co-conspirator.
Besides filling in the gaps for McVeigh's whereabouts, one senior official said agents had seen instances in the past where "death row inmates were willing to give us some of their thought processes as their execution neared, and we hoped McVeigh might do the same."
The officials would only discuss the interview debate on condition their names not be used. The Justice Department has ordered its employees not to discuss the McVeigh case as Nichols' trial begins this week.
Several officials said the debate over interviewing McVeigh continued between the FBI, Justice Department and Bureau of Alcohol, Tobacco and Firearms without resolution, ending when McVeigh was executed in June 2001.
Some called it a missed opportunity, especially because much of the speculation about additional accomplices in the Oklahoma City case focused on periods in which there were uncertainties about McVeigh's whereabouts.
For instance, agents never were able to determine where he spent the final night before he detonated his bomb. They also wanted to inquire about time he spent in Arizona in February 1995, when he began to finalize his bomb design.
FBI agents determined McVeigh tried unsuccessfully to contact an explosives expert while in Arizona, and they wanted to know whether he sought help from anyone else.
Since McVeigh was put to death — at the time, it was the first federal execution in 38 years — a steady stream of new evidence has called into question both the government's handling of the investigation and the official version of events:
key prosecution witness had given false testimony. Prosecutors didn't disclose the allegations to McVeigh's lawyers and later sought to recover all copies of the letter in exchange for a lawsuit settlement.
That prompted the FBI on Friday to reopen portions of the case to determine whether other conspirators were involved, and the judge in the Nichols' trial warned he might dismiss the case if defense lawyers provided proof information was withheld from Nichols.
Jury selection in Nichols' trial began Monday and initial screening of prospective jurors concluded Wednesday.
Nichols is already serving a life sentence on federal convictions for the deaths of eight federal law enforcement officers in the bombing. The state charges are for the other 160 victims and one victim's unborn fetus.
Prosecutors say Nichols, 48, helped McVeigh acquire components for the bomb, assisted McVeigh in building the device and robbed the Arkansas firearms dealer.