[7] Bush finished his rookie season with six starts in eleven games, 22 tackles and a pass breakup.

On December 23, Bush started at free safety against the San Francisco 49ers in place of an injured Eddie Jackson; he recorded two tackles in the 14–9 Chicago victory.

[10] In Week 2 of the 2020 season against the New York Giants, Bush recorded his first career interception off a pass thrown by Daniel Jones during the 17–13 win.

[17] Bush won Super Bowl LVII when the Chiefs defeated the Philadelphia Eagles.

[21] In the AFC Championship Game against the Baltimore Ravens, Bush recorded an interception on Lamar Jackson to prevail their victory and a trip to Super Bowl LVIII.