In order to have many groups come together and work towards legislation and controlling government decisions, a must be formed.
a. coalition
c. new party
b. union
d. group consensus

Generally speaking, in order to have many groups come together and work towards legislation and controlling government decisions, a "d. group consensus," since the only way for this to happen is to find "middle ground". 

The president of the united states does not have the authority to “limit” the power of the judicial branch. however, the president can influence the political direction of decisions made by justices on the supreme court through the nomination process when a position becomes available.i would say the best answer is that he can at least interpret the laws