A group of U.S. senators lobbied to meet with U.K. Prime Minister David Cameron during his upcoming U.S. trip to discuss BP's involvement in the early release of the Lockerbie bomber, but to no avail. According to the British Embassy, Cameron's busy schedule during the trip will not permit time for such a meeting, and the senators are welcome to meet with the British ambassador instead. The group of lawmakers is investigating whether British Petroleum negotiated a deal with Libya for the early release of Abdelbaset al-Megrahi in exchange for a $900 million offshore drilling deal with his native country. Cameron’s Conservative U.K. government has already admitted that al-Megrahi's release was a "mistake." Al-Megrahi was convicted of killing 270 people—including 189 Americans—in the 1988 bombing of Pan Am Flight 103 over Lockerbie, Scotland.