Why did confederate general robert e. lee decide to invade union territory

He invaded in an attempt to persuade the United States into a negotiated peace after a hoped-for decisive and damaging attack on Northern soil. 

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