Donald Trump has rejected the claims of a father of a fallen Muslim war hero and Democratic convention speaker who said that the GOP's presidential nominee has “sacrificed nothing” for his country. “I think I've made a lot of sacrifices. I work very, very hard,” the business mogul said in an interview with ABC News’ George Stephanopoulos to air Sunday, rebutting Khizr Khan’s statements against Trump made during final evening of the Democratic convention.