Background on the controversy
The resignation offer comes amid growing pressure on Raka over a court dispute involving his academic credentials. It was apparently not related to an ongoing probe into allegations that top police officials, including the president's chief of staff Gen. Listyo Sigit Prabowo, had been involved in a wiretap targeting the president. Three other police generals have also been implicated in the case.
Listyo previously served as national police chief under Widodo, who has not been implicated in the wiretapping investigation.
The developments come amid a widening political rift between Prabowo and Widodo. The popular former president backed Prabowo's presidential bid after he chose Raka as a running mate.
The controversy over Raka's academic qualifications escalated last month after the Supreme Court ruled that the documents he submitted regarding his overseas education did not meet election requirements.
The ruling intensified political pressure on Raka and fueled calls from some lawmakers for his impeachment.
Widodo faces unrelated allegations that he used a fake university diploma, which he denies.