The ultimate Congressional remedy is impeachment, which this ruling doesn't contemplate (except to reject silly arguments presented by the defense). However, the limits on congress and the judiciary are not absolute:
> Congress cannot act on, and courts cannot examine, the President’s actions on subjects within his “conclusive and preclusive” constitutional authority. It follows that an Act of Congress — either a specific one targeted at the President or a generally applicable one — may not criminalize the President’s actions within his exclusive constitutional power. Neither may the courts adjudicate a criminal prosecution that examines such Presidential actions.
It's only the executives exclusive powers (which are more limited) that cannot be restrained.
> Congress cannot act on, and courts cannot examine, the President’s actions on subjects within his “conclusive and preclusive” constitutional authority. It follows that an Act of Congress — either a specific one targeted at the President or a generally applicable one — may not criminalize the President’s actions within his exclusive constitutional power. Neither may the courts adjudicate a criminal prosecution that examines such Presidential actions.
It's only the executives exclusive powers (which are more limited) that cannot be restrained.