There is mounting evidence that Muslims inside and outside the US have been trying to impose Islamic lifestyle on the US through the introduction of Sharia and force Americans to become muslims or be killed as ISIS is now doing in Iraq and Syria.
It is nto appropriate to wait until the last minute to start scrambling for an answer.
The British have been facing the same threat and have just passed a new law (http://www.bbc.com/news/uk-30202006) the US needs to do the same.
This Sharia or Islam ideology according to which everyone has become muslim by force or be beheaded is a dangerous and unprecedented threat.
American mulslim citizens preaching violence must be arrested and foreign muslims deported to safeguard the country, the American way of life, and democracy.