The Dallas Cowboys are discussing with the Detroit Lions a trade for wide receiver Roy Williams, a team source told ESPN.com Tuesday. The source said the Cowboys are willing to make the deal, but the Lions seem hesitant because they are operating without a general manager. Former GM Matt Millen had discussed the possibility of trading Williams with the Cowboys frequently before he was fired. The Lions have been demanding a first-round draft choice just to consider a deal, and it is not known if Jones is willing to make the trade at that compensation level. The Cowboys could offer a second- and third-round pick, since they have multiple choices in the third round.