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Just a general FYI, general...
INVESTIGATION OF ILLEGAL OR IMPROPER ACTIVITIES IN CONNECTION WITH 1996 FEDERAL ELECTION CAMPAIGNS
Snip...National Security Council staff members were wary of Chung. On April 7, 1995, NSC staff member Melanie Darby sent an e-mail message to colleagues regarding the March 11 presidential radio address. She asked whether they felt the visitors should be given copies of the photographs taken that day. She wrote that President Clinton ``wasn't sure we'd want photos of him with these people circulating around'' and that the DNC had arranged for the six businessmen to visit without ``knowing anything about them except that they were D.N.C. contributors.''
It seems that somebody trusted somebody else who trusted somebody else who couldn't be trusted.
As I said earlier...It's deja vu all over again!

And speaking of "them", whoever that may be, and vetting...
From the same link...After the arms-dealing allegations were publicized, the White House determined that Wang Jun had not been vetted by the NSC (there had been only a ``summary background check'' by the DNC). The NSC was then asked what it would have recommended if it had performed a background check. Suettinger of the NSC stated in his interview that he believes that if he had been consulted he would have recommended against Wang attending a DNC event because of Wang's ``business connections, not his ties to the Communist government'' of China.112
Such minor things though. No sense getting too complicated as to specific responsibilities, is there.
Trust is a terrible thing to waste.