The United States hopes to drop Libya from its list of terrorism sponsors but “troubling questions remain” on an alleged Libyan plot to kill Saudi Crown Prince Abdullah, a senior U.S. official said on Wednesday. Interim Undersecretary of State for political affairs William Burns told lawmakers it may be possible open a U.S. embassy in Tripoli this year, capping the vast improvement in ties since Libya chose to abandon weapons of mass destruction. The United States in September ended the broad U.S. trade embargo on Libya as a reward for its December, 2003 decision to stop pursuing nuclear, chemical and biological weapons. Full Story