As if Rove couldn’t do that, and more effectively, from within the White House! :)
More likely: The ship is sinking and Rove is a rat.
Furthermore, the caller may be suffering from what I call ‘Rove paranoia’, or the idea that Rove is behind ‘everything’ and is so, so important.
The ship goes beneath the waves not long after Gonzales flees it, if he ever does.