physically and aware of the issues. >> vice president kamala harris defending her comments on migrants at the u.s./mexico border, while the president is abroad the next few days could pose a test of leadership for her. ♪ >> announcer: live from cnn center, this is "cnn newsroom" with robyn curnow. great to have you with me this hour. so the u.s. president will soon embark on a high stakes tour overseas, his first since taking office. after four years of mr. trump and america first, joe biden is expected to be laser focused on reestablishing america's role in the world. mending damaged alliances and fighting for democracy over autocracy. president biden will leave the u.s. in less than five hours' time. when he arrives in the uk he will meet with the american air