The most serious crisis of Ronald Reagan's two terms - and the lowest point in his popularity - came after the revelation that his administration had secretly sold arms to Iran and turned over the profits to rebels fighting the Marxist government of Nicaragua.
At the time he was asked if he'd made a mistake in sending arms to Tehran.
His response: "No and I'm not taking any more questions."
Reagan's national security staff approached Iran in an effort to free American hostages being held in Lebanon, despite a vow that the administration would never negotiate with terrorists.
http://www.cbsnews.com/stories/2004/06/07/eveningnews/main621620.shtml