Republican candidates attacking Trump are hurting their own chances. Before Trump's statement, they had little chance of ever catching up with The Donald.
Perhaps some should Google Theodore Roosevelt and see what he said on Immigration in 1907. We have strayed so far afield that we are allowing terrorists and would be terrorists at an unimaginable rate. How did the Pakistan terrorist get in this country unvetted properly, only to destroy the lives of hundreds of people. Yes, hundreds, including those left behind to who mourn deeply.
Again, Trump is right on England; an England with growing ghettos of Muslims where even Bobbies fear to tread. Trump should have included France.