mr. cokoefl less ski is hand capped i wouldn't know, i don't know what he looked like.colleague says trump does know him. >> i have zero question he knew serge by his first name and that he was mocking him on that stage. and that he has been lying all the time. >> reporter: kovalev ski says he's been covering trump for years, tweeting pictures he did on trump. in an interview he said, donald and i were on a first-name basis for years, i've interviewed him in his office." trump seems to have gotten good at offending. his latest target, muslims, with comments suggesting they be tracked with a national database. >> watch list is okay, surveillance is okay. >> -- to donald trump, i am a muslim -- >> reporter: mara, a muslim from california, posted an open letter firing back at trump. >> we're still americans. i feel if he's running to be the leader of our nation, he shouldn't be alienating us. >> reporter: she posted a photo wearing a peace sign as an i.d. badge following comments he wouldn't rule out the idea of muslims carrying special i.d. cards. tonight trump offering t