UPDATE 4:00 EST: Just an update here, Buster Olney just tweeted that the Diamondbacks are "making progress" on trading Jackson. Don't know if its connected to the three team trade or not.
According to ESPN's Jayson Stark, the Chicago White Sox, Washington Nationals, and Diamondbacks are looking into the possibility of three team trade. The reported deal would send slugger Adam Dunn to Chicago, pitcher Edwin Jackson to Washington, and a bunch of prospects to Arizona.
The White Sox have been in on Dunn since the beginning of the month as they look for a left handed power source. However, it is in question as to whether or not GM Mike Rizzo will deal Dunn as extension talks with him are off and on. The White Sox have also been in on Brewers first baseman Prince Fielder to fill their need for a left-handed power source.
For the Nats, the team has recently expressed interested in the D'Backs' Edwin Jackson. Jackson, hasn't had the best season so far but he he had an All-Star season with Detroit last season and certainly can perform well. Despite having a disappointing season, Jackson does have a no-hitter to his name and can contribute to a young pitching staff like the Nationals have.
The D'Backs have showed that they are ready to throw in the white towel and conduct a fire sale as yesterday they dealt Dan Haren the the Angels in a salary dump situation. Jackson could be next to go.