Bush, 27, has 130 career tackles, three interceptions and one forced fumble.
Also visiting the Cardinals today is Pittsburgh Steelers defensive back William Gay. Gay has been a productive member of the Steelers' nickel and dime packages since entering the league in 2007. After starting only four games in 2010, Gay started 15 last season.
He has recorded 247 tackles, three interceptions, three sacks and three forced fumbles in his five seasons in the league.
Gay brings championship experience as well as he has two Super Bowl rings with the Steelers.
Both Gay and Bush would add depth and experience to the Cardinals defensive backfield.