see you back here at 4:00. tonight, vice president kamala harris testing positive for covid. and what the white house said today about president biden. vice president harris now in isolation at home, testing positive after being vaccinated and double boosted. and when was the last time she was in close contact with president biden? cecilia vega standing by live at the white house. the u.s. responding tonight russia sewest warning of the daer nuclear w sy. and tonight, germany, for the first time, sending ukraine heavy weapons. marcus moore in kyiv tonight. the developing headline as we come on the air. the audio tonight of house republican leader kevin mccarthy. you will hear what he said, his concerns after january 6th, over members of his own party fufling unrest in this country. asking at one point, can t they