Washington (CNN) - Four U.S. senators have requested a formal meeting with British Prime Minister David Cameron during his visit to the United States this week to discuss the 2009 release of a man convicted of playing a role in the bombing of Pan Am Flight 103 over Lockerbie, Scotland.
The 1988 bombing killed 270 people, most of them Americans.
The Scottish government released Abdelbaset Ali Mohmed al-Megrahi on compassionate grounds last August after doctors said he had terminal prostate cancer and just three months to live. But al-Megrahi is still alive, and news reports in recent days have questioned whether he was as sick as depicted. Questions also have been raised about whether a deal was cut to release him to protect British business interests in Libya.