Jefferson's domestic policy was uneventful and hands-off, the administration mainly concerning itself with foreign affairs and particularly territorial expansion. Except for Gallatin's reforms, their main preoccupation was purging the government of Federalist judges. The president and his associates were widely distrustful of the judicial branch, especially because Adams had made several "midnight" appointments before leaving office in March 1801. In "Marbury vs Madison" (1803), the Supreme Court under John Marshall established the precedent of reviewing and overturning legislation passed by Congress. This ruling by leading Federalists upset Jefferson to the point where his administration began opening impeachment hearings against judges perceived as abusing their power. The attempted purge of the judicial branch reached its climax with the trial of Supreme Court Justice Samuel Chase. When Chase was acquitted by the Senate, Jefferson abandoned his campaign.