The Senate blue slip is an informal Senate Judiciary Committee tradition that gives the two senators from a federal judicial nominee’s home state a chance to signal support or opposition before the committee acts. The committee mails each home-state senator a slip printed on blue paper; the senator can return it endorsing the nominee, return it opposed, or not return it at all. Depending on who chairs the committee, a negative or withheld slip can slow a nomination, kill it outright, or barely matter. The practice is not in Senate rules or committee bylaws. It survives because each chair chooses to honor it.1United States Senate Committee on the Judiciary. Grassley Speaks on the History of the Blue Slip Courtesy for Judicial Nominees
How the Process Works
When the President nominates someone to a federal district court or court of appeals seat, the Judiciary Committee sends a blue slip to each of the two senators from the state where the vacancy exists. The form asks the senator to indicate whether they endorse or oppose the nominee.2U.S. Senator Chuck Grassley. Q&A: Blue Slips The same procedure covers nominations for U.S. Attorneys and U.S. Marshals, but judicial nominations draw the most attention because federal judges hold their seats for life.
The senator has three options: return the slip positive, return it negative, or simply not return it. Withholding the slip has historically functioned as a pocket veto, since some chairs have treated a missing slip the same as a negative one. There is no formal deadline, though committee chairs typically expect a response within a few weeks. Senate offices generally review the nominee’s background, judicial philosophy, and local reputation before deciding.
Part of the point is to push the White House to consult home-state senators before picking a nominee, not just after.2U.S. Senator Chuck Grassley. Q&A: Blue Slips A president who ignores a senator’s preferences risks a negative slip that stalls the nomination at the committee stage, so administrations of both parties usually work with senators early, especially on district court picks.
District Court Versus Circuit Court
The blue slip does not carry equal force across all federal courts, and the gap widened sharply in 2017. For district court nominees, both home-state senators are still expected to return positive blue slips before the committee will schedule a hearing. A district judge sits in one state, and the senators from that state are treated as best positioned to know the nominee’s reputation and the local court’s needs.2U.S. Senator Chuck Grassley. Q&A: Blue Slips
Circuit courts are treated differently. Appellate courts cover multiple states, so the case for letting one state’s senators control a nomination is weaker. In 2017, then-Chairman Chuck Grassley announced the committee would no longer require two positive blue slips to move forward on circuit court nominations. That policy has stayed in place through every chair since, including Lindsey Graham (2019–2021), Dick Durbin (2021–2025), and Grassley again in his current second stint as chair.3Congressional Research Service. The Blue Slip Process for US Circuit and District Court Nominations
The practical effect is a two-track system. A senator opposing a circuit court nominee from their state can still register a negative blue slip, but the committee may hold a hearing and vote anyway. For district court nominees, a negative or withheld blue slip functions much closer to a genuine veto.
What a Negative or Withheld Slip Actually Does
The consequences depend on the chair’s policy at the moment. Under a strict interpretation, one senator’s opposition ends the nomination inside the committee. No hearing gets scheduled, no vote happens, and the nomination expires at the end of the congressional session without ever reaching the Senate floor.
Under a more permissive policy, a negative slip is noted but does not stop the process. The chair schedules a hearing, the committee votes, and the nomination can move to the full Senate over the home-state senator’s objection. Since the 2017 change for circuit courts, several appellate nominees have been confirmed this way, including judges on the Second, Third, Sixth, and Ninth Circuits.3Congressional Research Service. The Blue Slip Process for US Circuit and District Court Nominations
District court nominees run into a harder wall. Because the strict policy still applies to them, a home-state senator’s opposition is far more likely to freeze the nomination. Several district court nominations in recent years have been returned without action at the end of a Congress after a home-state senator held onto their slip.
Why the Committee Chair Decides Everything
Because the blue slip is an unwritten custom, its force rests on the chair’s willingness to enforce it. A chair who honors the tradition strictly hands real leverage to individual senators, particularly those in the minority party. Those senators can use the slip to press for alternative nominees, negotiate with the White House, or block appointments outright without ever casting a public vote.
A chair who relaxes the tradition shifts power back toward the president and the committee majority. Home-state senators still get consulted as a political matter, but their opinion loses procedural teeth. The strictness has swung back and forth across chairs for decades. Chairman James Eastland established a hard two-slip requirement in 1956; Chairman Ted Kennedy later dropped the automatic veto; Chairman Patrick Leahy restored the strict rule; Grassley split it, keeping the strict version for district courts and loosening it for circuit courts.4GovInfo. Congressional Record – Blue-Slip Courtesy
Senators tend to favor a strong blue slip when they are in the minority and want to block an opposing president’s nominees, and a weaker one when their own party controls the White House. Because nothing about the practice is written into committee rules, any future chair can change the policy without a vote.3Congressional Research Service. The Blue Slip Process for US Circuit and District Court Nominations That instability is the tradition’s central feature: every new chair inherits the choice, and the choice quietly shapes the federal bench for years.
Where the Practice Came From
Senate Judiciary Committee Chairman Charles Culberson created the blue slip in 1917 to solicit home-state senators’ views before the committee acted on a nomination.1United States Senate Committee on the Judiciary. Grassley Speaks on the History of the Blue Slip Courtesy for Judicial Nominees The move brought an older Senate custom of home-state deference off the chamber floor and into the committee stage, where a single senator could quietly block a nominee without forcing a public confrontation. The mechanism has looked essentially the same ever since. Its power has not.