White House chief of staff James A. Baker III has provided the FBI with detailed documents listing his telephone calls and meetings in the period during the 1980 campaign when the Reagan camp obtained briefing materials prepared for President Carter, according to sources close to the investigation.
Baker reportedly has identified for investigators the period during which he said he believes he received the Carter briefing material from CIA Director William J. Casey, then President Reagan's campaign manager.
According to the sources, Baker has told the investigators that he received the briefing material from Casey several weeks before the debate between Reagan and Carter on Oct. 28, 1980.
Previous accounts have suggested that the briefing material was obtained by the Reagan camp just before the debate took place.
However, it could not be learned today precisely what period Baker has identified as the time during which he received the documents.
Baker has said publicly that Casey gave him a black binder containing briefing material for Carter's use in preparing for the debate. Casey has said that he does not remember seeing the material or giving it to anyone.
According to the sources, Baker kept careful logs of the people he spoke with and met during the period in the campaign before the debate.
The sources said Baker's records were verified by investigators who checked with some of the people listed.
Some FBI officials have said that the FBI is seeking permission to give polygraph tests to about a dozen people to resolve inconsistencies that have developed in the investigation. Baker and Casey reportedly are among them. So far, however, neither Baker nor Casey has been asked to take lie-detector tests, sources said.
It also was learned from an administration source that Baker is willing to take a lie-detector test if asked.
White House spokesman Larry Speakes said last week that Reagan would have no objection in principle to his aides submitting to polygraph tests in the FBI investigation.
Aides to Baker have said previously that he is confident that he has told the truth and that his memory is accurate about the briefing book episode and that he is anxious for the investigation to be completed. Baker has been interviewed twice by FBI agents, the second interview focusing on reports that national security information from the Carter White House was made available to the Reagan campaign.
Baker was Reagan's representative in negotiating the debate format and arrangements with the Carter camp.
Casey, who then was the Reagan campaign manager, has said that he does not recall giving the material to anyone. Casey was out of town today and unavailable for comment, a CIA spokesman said.
Baker refused to comment.
Baker and Casey have provided different versions of the briefing book episode since they were first asked for an explanation by Rep. Donald J. Albosta (D-Mich.), chairman of a House Post Office and Civil Service subcommittee.