Rep. Raul Grijalva, D-Ariz., and nine other House members sent a letter to the head of the FBI asking for an investigation into whether the Trump Organization knowingly hired workers without the proper documents, and even helped them procure false ones as some workers have alleged.

The letter says the allegations by workers interviewed in media reports raise “serious questions of criminal activity and numerous violations of employment laws” including conspiracy charges and forced or coerced labor.

“Instead of hiding in the shadows, some of these brave workers have now decided to come forward and detail an elaborate ploy by the Trump Organization to systematically procure cheap immigrant labor and employ undocumented immigrants – despite knowing that the documents they provided were false,” the House members wrote.