anderson cooper for this live town hall on guns in america. 8:00 p.m. eastern right here on cnn. also ahead for us as republicans threaten a legal challenge to the president s gun measures, one top lawmaker is calling for the president to shift his focus to what he actually calls the real issue behind gun violence. he will be joining us next. and no signs so far of radiation. skepticism is now growing over whether north korea actually tested a hydrogen bomb but that nation s lead are, kim jong-un, says he ll prove that test was a success. cnn is in yong nang.