Follow live updates on the AP Top 25 poll . Get the AP Top 25 college football poll delivered straight to your inbox every week with AP Top 25 Poll Alerts. Sign up here . ANN ARBOR, Mich. (AP) — The Big Ten Conference pushed back Tuesday on a claim by a University of Michigan regent that Commissioner Tony Petitti threatened to punish the school if it refuses to support a plan that would clear the way for $2.4 billion in private investment in the league. Mark Bernstein, chairman of the Michigan