the invasion on Cambodia led to a rise in opposition in Congress
Congress repealed the Gulf of Tonkin Resolution in mid 1970
They set a limit on funding US troops in Cambodia, and set end of June for full withdrawal of involvement in Cambodia
the end of 1971 was set for the final withdrawal of troops
After the Paris Peace Accords, Congress reduced funding to South Vietnamese gov. as Nixon promised
This lack of support quickened the collapse of the South Vietnamese gov.