and mourning. abc's tahman bradley joins us, now, from washington, with the details. good morning, tahman. >> reporter: diana and john, good morning. president obama is in south korea, meeting with his south korean counterpart, who is being consumed by an awful tragedy. president obama's trip to seoul is being overshadowed by last week's deadly ferry disaster. south koreans are mourning the dead or missing, about 300 people, a majority, high school students. across the country, people are wearing yellow ribbons. president obama is still pushing ahead with his agenda. he led a naturalization ceremony for military service members and their spouses. there, the president sent the u.s. congress a message. >> america is strengthened by our immigrants. we're a nation of immigrants. moving forward, we have to fix our broken immigration system and pass common sense immigration reform. >> reporter: mr. obama paused to remember the victims of the korean war, laying a wreath at the country's...