Michigan head coach Jim Harbaugh reacts towards a game official after a call during the second half of an NCAA college football game against Indiana, Saturday, Nov. 7, 2020, in Bloomington, Ind. Indiana won 38-21. (AP Photo/Doug McSchooler)

Penn State head coach James Franklin talks with an official during the fourth quarter of the team's NCAA college football game against Ohio State in State College, Pa., on Saturday, Oct. 31, 2020. Ohio State won 38-25. (AP Photo/Barry Reeger)

Nebraska head coach Scott Frost talks to his team during the first half of an NCAA college football game against Northwestern in Evanston, Ill., Saturday, Nov. 7, 2020. Northwestern won 21-13. (AP Photo/Nam Y. Huh)