McAuliffe said those sent the letter, and those individual felons who are granted rights in the future, will be subject to a “thorough review’’ that involves agencies including the Virginia State Police, Department of Corrections, Department of Criminal Justice Services, Department of Juvenile Justice, Department of Behavioral Health, and the Secretary of the Commonwealth’s office.

The governor had promised to swiftly restore rights a second time on an individual basis for the roughly 13,000 ex-offenders who registered to vote before the Supreme Court’s ruling. Administration officials Monday said the process took about three weeks and more than a dozen staffers to complete.

The restoration announcement for the 13,000 applied to felons who had been granted their voting rights under McAuliffe’s mass civil rights restoration orders in April, May and June but were ordered stricken from the voting rolls when the Supreme Court of Virginia rescinded the order after a legal challenge by Republican leaders in the General Assembly.

McAuliffe said restorations will be handled in the order of those who have waited the longest. He said the administration will release a list of all people whose rights have been restored on the 15th of each month.