'' National Review '' magazine published his essay " What Is An American ? " in its September 25 , 2001 issue , after the September 11 attacks . In the essay , he claims that " there are more Muslims in America than in Afghanistan " , although census numbers show Afghanistan has roughly ten to fifteen times as many Muslims as the United States . The essay was reproduced in a chain e-mail claiming that an Australian dentist wrote it . Ferrara , reflecting on that essay in 2007 , still stood by it and supported " more selective immigration so that the U.S. gets a ' better-educated class of Mexican immigrants . ' " Ferrara has also written about climate change , asserting that human activity is not the cause of climate change , that " manmade global warming " is political science rather than natural science , and that actual scientific evidence proves the earth is in a cooling cycle
September 11 attacks
September 11 attacks
Peter Ferrara