And newly released FBI documents reveal both the Nixon and Reagan administrations ordered the monitoring of witnesses set to provide critical testimony about former Chief Justice William Rehnquist. In 1971, the Nixon White House ordered the FBI to run background checks on witnesses in Rehnquist’s initial Senate confirmation hearing. When Rehnquist was nominated to chief justice 15 years later, the Reagan administration told the FBI to check on the witnesses and find out what they planned to say. The FBI obtained the names from then-Assistant Attorney General John Bolton. Bolton was the Bush administration’s U.N. ambassador until last month. The documents also show the FBI was aware in 1971 Rehnquist owned a home in Phoenix that was only allowed to be sold to whites. The clause was only disclosed 15 years later, and Rehnquist claimed he was unaware. The new files also reveal details of Rehnquist’s dependency on prescription painkillers. In 1981, doctors reported Rehnquist exhibited severe withdrawal after he stopped receiving the medication. Rehnquist was said to have tried to escape from a hospital stay in his pajamas after convincing himself of a CIA plot against his life. The FBI has withheld an additional 200 pages in Rehnquist’s file and says one entire section cannot be retrieved.