  In terms of a new QCD factorization formula for J/$\psi$ production, we
calculate the J/$\psi$ suppression in nuclear collisions by including the
multiple scattering between the pre-J/$\psi$ partonic states and the nuclear
medium. We find agreement with all data on J/$\psi$ suppression in
hadron-nucleus and nucleus-nucleus collisions, except a couple of points (the
``second drop'') at the highest $E_T$ bins of the new NA50 data.
