Columbia University said it does not plan to call off a speech by Iran's president despite pressure from critics including the City Council speaker, who said the Ivy League school was providing a forum for "hate-mongering vitriol." Mahmoud Ahmadinejad is traveling to New York to address the United Nations' General Assembly. He was scheduled to appear Monday at a question-and-answer session with Columbia faculty and students as part of the school's World Leaders Forum. City Council speaker Christine Quinn called Thursday for the university to rescind the invitation, saying "the idea of Ahmadinejad as an honored guest anywhere in our...