New Jersey Democrat Robert Menendez is asking whistleblowers to contact his office. Menendez says all information will remain confidential and names won't be disclosed unless permission is granted.
Menendez is leading a Senate Foreign Relations Committee investigation into last year's release on compassionate grounds of Abdel Baset al-Megrahi because of a diagnosis of terminal cancer. He was the only person jailed for the 1988 bombing above the Scottish town of Lockerbie, which killed 259 people - mostly Americans - onboard and 11 on the ground.
Menendez is examining what role BP PLC may have played in the release.
A hearing was canceled earlier this month after BP, British and Scottish government officials declined to attend.