House Republicans are stepping deeper into the labor fight between Boeing Co. and one of the company’s labor unions, as a committee chairman has issued a subpoena to the National Labor Relations Board.

Rep. Darrell Issa (R-Calif.), the chairman of the House Committee on Oversight and Government Reform, issued the subpoena on Sunday, according to Issa’s office. The subpoena demands copies of documents from the NLRB and its acting general counsel, Lafe Solomon, as well as records of communications about Boeing and the labor union.

In April, Solomon brought a complaint against Boeing, alleging that the company illegally interfered with the rights of workers to organize when company officials threatened to take away work in retaliation for strikes. Boeing is fighting the complaint in an administrative proceeding, and the complaint has galvanized politicians in South Carolina, where Boeing expanded its operations after strikes in Washington state.

Issa has been critical of Solomon and the NLRB for intervening in the fight on behalf of the union, a local of the International Association of Machinists and Aerospace Workers.

“As this matter could take years to resolve and create even more crippling uncertainty for job creators, it is imperative that Congress get complete facts about NLRB’s [rationale] and its decision-making process in this matter without further delay,” Issa said in a statement today.

A message left with the NLRB was not immediately returned.

David Ingram can be contacted at dingram@alm.com.