Senator Jeff Flake “will continue to vote no on all judicial nominees,” a spokesperson for the senator told Bloomberg Law.

Flake, a retiring Republican from Arizona, has vowed to oppose judicial nominees until the Senate allows a vote on legislation to protect special counsel Robert Mueller’s investigation into Russia’s involvement in the 2016 presidential election.

Senate Judiciary Committee Chairman Chuck Grassley (R-Iowa) scheduled committee votes for Thursday on a package of nominees, including six of President Donald Trump’s appeals court picks. Grassley will likely reschedule the votes given Flake’s stance.

The 21-member committee has 11 Republicans, meaning that Flake could potentially block any nominees before it by voting with the Democrats.

Judicial confirmations have been a signature achievement for the Trump administration. Trump has appointed appeals court judges at a record-setting pace, with 29 confirmed so far.