"Trump's sentence only makes sense as a statement of racial and religious paranoia. The 'south' and 'east' only threaten the West’s 'survival' if you see non-white, non-Christian immigrants as invaders. They only threaten the West’s 'survival' if by 'West' you mean white, Christian hegemony. A direct line connects Trump's assault on Barack Obama's citizenship to his speech in Poland. In Trump and Bannon's view, America is at its core Western: meaning white and Christian (or at least Judeo-Christian). The implication is that anyone in the United States who is not white and Christian may not truly be American but rather than an imposter and a threat."
Peter Beinart at The Atlantic criticizes Donald Trump's speech in Poland.
As does Jeet Heer at The New Republic.
As does David Frum at The Atlantic.