Gun violence after another deadly weekend. we ll ask domestic policied a vilzer, former national security adviser, susan rice, about the move next. as we go to break, john lennon s son, julian, performed for the first time his late father s most iconic solo song, imagine. julian lennon covered his father s anthem as part of the stand-up for ukraine global fund-raising campaign broadcast from poland. the performance ended the 59-year-old s previous vow to never perform his father s famous work. lennon explained in a youtube post, the unimaginable tragedy in ukraine compelled him to respond in the most significant way he could. this is remington.