Six of the House Ethics Committee's 10 members removed themselves from the case and were replaced Friday, saying they wanted to erase any questions of bias.
Waters, a Democrat, is accused of trying to get federal aid for a minority-owned bank that lists her husband as an investor. She denies any wrongdoing.
In addition to five Republicans, democratic Congresswoman Linda Sanchez also dropped out of the investigation, which has been going on for more than two years.
