What was a major obstacle to drafting a new constitution at the constitutional convention of 1787?

At the Constitutional Convention of 1787, a major obstacle to drafting a new constitution was the disagreement between the states over representation in Congress.

United states v.  nixon, 418  u.s.  683 (1974),  was  a landmark  united states supreme court case  that resulted in a unanimous  decision  against president richard  nixon, ordering him to deliver tape recordings  and  other subpoenaed materials to a  federal  district  court.