Umar Farouk AbdulMutallab had come to Yemen in the hope of meeting the cleric.
Investigators have said intelligence ties the bombing suspect, Umar Farouk AbdulMutallab, to the group.
How cooperative has Abdulmutallab been after he was arrested and since he got a lawyer?
After arriving in Amsterdam, AbdulMutallab boarded the Northwest Airlines flight to the United States.
Umar Farouk AbdulMutallab is being held by the U.S Marshals Service in an undisclosed location.
And two recent media reports have quoted al-Awlaki as admitting he met with AbdulMutallab.
And from what Rafiq could remember, AbdulMutallab opposed fundamentalist Islamic views that encouraged such violence.
The last time Rafiq talked to AbdulMutallab was about 13 or 14 months ago, Rafiq said.
At high school in Togo, Brako recalls that AbdulMutallab usually wore jeans and a T-shirt.
Qadhi says there was no indication AbdulMutallab in 2008 was extreme in his views.
The State Department should have revoked AbdulMutallab's visa, or authorities should have questioned him, she said.
CNN: Senators hear testimony on alleged Christmas Day bomb plot
At the Amsterdam airport, Abdulmutallab was subjected to the same screening as other passengers.
Russell Feingold, D-Wisconsin, were mystified by the reaction to the decision to try AbdulMutallab in federal court.
On December 25, Chukwu was seated about five rows behind AbdulMutallab when the bombing attempt took place.
AbdulMutallab faces a federal indictment issued Wednesday, including an attempt to murder the other 289 people aboard.
That list contains the names and aliases of about 400, 000 people, but AbdulMutallab didn't make the cut.
But then AbdulMutallab cut off contact with him and other friends they had in common, Rafiq said.
They began an extensive investigation and tried to work with AbdulMutallab's family in hopes of gaining his cooperation.
Now it is clear the NCTC was never told by the State Department that AbdulMutallab had a visa.
CNN: State Department failed to confirm terror suspect's visa
In the fall of 2005, he moved to England at the same time as AbdulMutallab to start university.
The problem in this case was that Mr Abdulmutallab was never transferred from Tide to the watch lists.
BBC: Security reforms on the way following 'jet bomber' case
Mr Abdulmutallab's name was added to the Terrorist Identities Datamart Environment database, but not put on a no-fly list.
That doesn't count Abdulmutallab, who was the subject of warnings to the CIA that he was a potential terrorist.
But he asked whether full-body scanners would have been effective in detecting the substances allegedly carried by Mr Abdulmutallab.
Abdulmutallab, who had a multiple entry visa to the United States, was charged Saturday in a federal criminal complaint.
AbdulMutallab, 23, was studying abroad when he "disappeared" and stopped communicating with his relatives, they said in a statement.
Several Republican members of Congress have called for prosecuting AbdulMutallab before a military tribunal rather than in civilian courts.
AbdulMutallab, 23, faces a six-count federal indictment, including an attempt to murder the other 289 people aboard Flight 253.
Abdulmutallab is certainly someone who should have gone through the full scanning process at least once, if not twice.
We're going to beef up airport security, because Umar Farouk AbdulMutallab allegedly snuck a bomb through a security checkpoint.
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