Marist Liufau steps up in the Cowboys' defense. Watch the rookie's key plays and tackles as he gets more action on the field.

OXNARD, Calif. -- There were things that actually happened on the field on Saturday at Cowboys training camp practice. Truly.

Dallas Cowboys' superstar linebacker Micah Parsons requested a trade on Friday. The Buffalo Bills are viewed as one of the favorite to land him if he gets dealt ...