The Nationals aren't the only team expressing interest in Diamondbacks right-hander Edwin Jackson, according to sources. According to sources, Washington actually isn't even expressing direct interest yet. The Nationals are first trying to obtain the necessary starting pitcher for the Diamondbacks through a trade involving first baseman Adam Dunn. The Diamond The Diamondbacks, just as they did when the moved right-hander Dan Haren, want a potential 200-inning replacement.