How did the Assassin know about Gavin?

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Vereek gave the Pelican Brief he was given by his good friend Callahan to his boss who then spread it around. Undoubtedly Vareeks name was at the bottom of a memo that was attached to the Brief and it is not unlikely that he would have mentioned that he got it from a friend. The front of the Brief has Darby's name on it as well as who she was giving it to....we see that early on. One can also presume that there was a leak somewhere along the way as we can easily imagine someone of Matteice's position, which is placed high enough that he can call for the assassination of two Supremes and know that his Buddy the President will nominate replacements to his liking, being in a position to have spies in a lot of gov`t organizations. Thus, assuming that Matteice is made aware of the Brief, the names associated with it, and who is passing it around he can then track the individuals and have them killed at will. Are there plot holes or lapses.... of course. It is a movie after all. The plots around Kamal are not them.