Donald Trump’s spokesman fired back at former “Apprentice” star Omarosa Manigault Newman for questioning the former president’s health and fitness. Newman, who served as director of communications for the Office of Public Liaison during his presidency, called on journalists to ask specific questions about Trump’s cardiac health and recalled instances during her White House tenure when he forgot the names of Cabinet members and important policy details, but the GOP nominee’s spokesman Steven Cheung issued a statement disputing those recollections. “President Trump has more energy and more stami…