  By using relations derived from renormalization group equations (RGEs), we
find that strong indirect constraints can be placed on the top squark mixing
phase in At from the electric dipole moment of the neutron (dn). Since mtop is
large, any GUT-scale phase in At feeds into other weak scale phases through
RGEs, which in turn contribute to dn. Thus CP-violating effects due to a
weak-scale At are strongly constrained. We find that |Im At(mz)| must be
smaller than or of order |Im B(mz)|, making the electric dipole moment of the
top quark unobservably small in most models. Quantitative estimates of the
contributions to dn from Au, Ad and B show that substantial fine-tuning is
still required to satisfy the experimental bound on dn. While the low energy
phases of the A's are not as strongly constrained as the phase of B(mz), we
note that the phase of a universal A(GUT) induces large contributions in the
phase of B(mz) through RGEs, and is thus still strongly constrained in most
models with squark masses below a TeV.
