Michigan's Jim Harbaugh says error made in vetting process with Glenn Schembechler

Michigan coach Jim Harbaugh said on Thursday that a mistake was made during the vetting process in the recent hire of Bo Schembechler's son, who resigned last month following offensive social media activity.

Glenn "Shemy" Schembechler, 53, stepped down just three days after he was hired as the team's assistant director of recruiting. He conceded in a statement that he engaged in "flippant behavior on Twitter," which included numerous offensive and insensitive posts, including several suggesting slavery and Jim Crow had the positive effect of strengthening Black individuals and families.

"Once I became aware of things that were offensive -- offensive to me, offensive to other members of our…