Senate Democrats on Thursday will join their Republican colleagues in pressing the administration for more information about the deadly attack that killed Ambassador Christopher Stevens and three other Americans in Benghazi.

“I will say that this has now turned into a very bipartisan concern,” Sen. Bob Corker (R-Tenn.) told Fox News Thursday morning. “It’s my understanding today that all members of the Foreign Relations Committee — both Democrats and Republicans — are asking the administration for answers. So this is now something that certainly could never be colored as partisan.”

{mosads}The Senate Foreign Relations Committee said a bipartisan letter is in the works, but did not reveal details of what it would include.

The letter comes as Republicans have attacked the Obama administration’s muddled explanation of what happened in Benghazi on the anniversary of the Sept. 11 attacks.

Officials initially attributed the attack to a spontaneous protest against an anti-Islam video before labeling the assault an act of terrorism several days later. The administration continues to say the attack was not planned in advance, despite Stevens’s reported concerns that he might have been on al Qaeda hit list and multiple media reports that have called the administration’s account into question.

Adding to the confusion, Secretary of State Hillary Clinton on Wednesday appeared to draw a link between the Libya attack and al Qaeda.

“Now, with a larger safe haven and increased freedom to maneuver, terrorists are seeking to extend their reach and their networks in multiple directions,” she said in comments on North Africa at the United Nations Wednesday. “And they are working with other violent extremists to undermine the democratic transitions under way in North Africa, as we tragically saw in Benghazi.”