Hillary Clinton and her two-dozen staffed campaign have been diving extensively into Donald Trump’s background and past, looking for ways to get under his skin before the first debate rolls around. In fact, the Clinton campaign has one specific target in mind to undermine Trump: “The Art of the Deal” co-author Tony Schwartz.

Schwartz shadowed Trump at his office for 18 months in preparing to write the book, spending weekends with him at his Manhattan pad and traveling with Trump on out-of-state trips. Clinton strategists are hoping that by talking to Schwartz, they can attain incriminating ammo against Trump at the debates.

If Schwartz’s intel doesn’t prove to be useful, the Clinton campaign will utilize at least 25 researchers to detail through four decades of Trump’s background. Their primary goal for the debates is to simply use information that can be used against him.

The first debate between Clinton and Trump is set for Sept. 26 in Hempstead, N.Y. Whether Hillary Clinton actually attains any information from Schwartz to use against Trump remains to be seen.