Per Roto World:
According to Nationals writer Bill Ladson, Washington is discussing Joel Hanrahan, not John Lannan, with the White Sox.
That makes a lot more sense. The White Sox would prefer a reliever anyway, and Lannan is someone the Nationals look at as a building block. Hanrahan won't come cheap, either, but he is a more realistic target.
That's too bad, cause I really wanted Lannan.