The National Labor Relations Board, the federal government’s main labor law enforcement agency, announced Friday that it would conduct a comprehensive internal review of its ethics rules to examine rules on when NLRB members should recuse themselves from decisions.

The announcement came four months after the NLRB abruptly reversed a major ruling after the board’s inspector general determined that NLRB member William Emanuel should have recused himself from voting the case. Emanuel has said he should not have had to withdraw from the case.