Any motion for recusal and reassignment of a judge should be filed, at least initially, with the presiding judge. See Stephenson v. National Aeronautics & Space Administration, 1994-TSC-5 (Sec'y Dec. 13, 1995).

Any person alleging that an administrative law judge has engaged in conduct prejudicial to the effective and expeditious administration of the business of the OALJ, or that the judge cannot discharge all the duties of the office because of physical or mental disability, may file a complaint with the Chief Administrative Law Judge. This complaint process is intended to address a judge's conduct, and is not an appropriate forum to address complaints about a litigant's disagreement with a judge's rulings about procedure or the merits of a case. Such disagreements are more properly addressed to the appropriate appellate body, usually the Benefits Review Board in black lung and longshore cases, and the Administrative Review Board in other types of cases.

https://www.dol.gov/agencies/oalj/about/FAQ15