Probably for the same reason the Clintons rolled over for them.
My own NSHO is that Bill Clinton was recruited by KGB at a very young age and turned over to the Chinese BuDer in the 60's or 70's, thereafter becoming a Manchurian candidate. I think his original contact and talent-spotter was Sen. Bill Fulbright, for whom Clinton interned as a teen, and his case officer was Yah Lin "Charlie" Trie, a Chinese "restaurateur" who came all the way from Hong Kong (yeah, right) to Little Rock, to answer the raging call of Arkansas diners for decent moo shoo pork (yeah, right).