New York lawyer Caitlin Halligan asked President Obama to withdraw her nomination to the U.S. Court of Appeals for the District of Columbia Circuit. (Politico via AP)

The White House has withdrawn the nomination of Caitlin Halligan to the U.S. Court of Appeals for the District of Columbia Circuit, weeks after Republicans filibustered a vote on her nomination for the second time.

Halligan requested that President Obama withdraw her nomination.

"I am deeply grateful to you for your confidence in me, and your steadfast support of my nomination," she wrote in a letter to the president. "After much reflection, I believe that the time has come for me to respectfully ask that you withdraw my pending nomination from further consideration by the United States Senate."

Read Halligan's letter.