He asked the journalist to write petition against Tinubu.
Magu gave the charge in Abuja on Monday while fielding questions from reporters at an event held in commemoration of his third year in office.
A journalist had asked Magu when he would probe Tinubu who had purportedly claimed in a video in August that he was richer than Osun State.
The journalist also asked why Magu was refusing to answer questions on the video which allegedly captured the Governor of Kano State, Abdullahi Ganduje, receiving bribes from contractors.
In his response, Magu said, “You know what? If you are really interested, write a petition and see whether I won’t act. Go and write a petition and substantiate in the petition and find out if I won’t act. It is not for us to listen to people on radio and begin to act. Yes, we have intelligence but the surest way to get action is to go and write a petition and substantiate the contents of the petition and see whether I will not act.”