What bill did Harry Reid filibuster in 2003?

In 2003, Harry Reid led a filibuster against the nomination of judicial nominee Miguel Estrada to the U.S. Court of Appeals for the D.C. Circuit. Reid and other Democrats opposed Estrada's nomination, arguing that he was too conservative and that his judicial philosophy was unclear. The filibuster was part of a broader Democratic strategy to block several of President George W. Bush's judicial nominees. Ultimately, the filibuster was successful, and Estrada's nomination was never brought to a vote.