Demonstrations are a form of political activity in the United States, and one popular place for them is the sidewalk in front of the white House in Washington D.C. People demonstrate there in order to call the President is attention to an issue, and also to gain national publicity. The government cannot prohibit these demonstratiins because thr right of free speech is guaranteed in the U.S. cinstitution. However, there are laws which regulate demonstrations on the White House sidewali, and the pplice enforce the regulation.