The U.S. Senate on Wednesday adopted a non-binding resolution denouncing Libya for giving a "lavish welcome home" to Abdelbaset Ali Mohmed al-Megrahi, who had been jailed for the Lockerbie bombing but was released early last month.
The resolution asked Libya "to apologize for the public celebration" of al-Megrahi's return on August 20.
"The hero's welcome shocks the conscience and deserves a formal rebuke," said Democratic Senator Chuck Schumer.
In mid-August, the Scottish government ordered the early release of al-Megrahi, who was convicted in 2001 and sentenced to life in jail for his part in the bombing of Pan-Am Flight 103 that exploded over Lockerbie, Scotland, on Dec. 21, 1988. A total of 270 people, including 189 Americans, were killed.
Scotland freed al-Megrahi on humanitarian grounds because he has terminal cancer.
U.S. President Barack Obama expressed disappointment over al-Megrahi's early release during a phone conversation with British Prime Minister Gordon Brown earlier this month.