A federal judge on Monday ruled that the Attorneys General of both Maryland and Washington, DC, can begin discovery as part of their suit against President Donald Trump regarding alleged unlawful profits from his DC hotel.

The original complaint points to instances of foreign dignitaries staying at the Trump International Hotel while visiting the president in an official capacity. Both Attorneys General claim violations of the Emoluments Clause in the US Constitution, which prohibits the president from personally accepting money from foreign governments.

The ruling on Monday allows the Attorneys General to begin both fact and expert discovery measures. This includes, but is not limited to, sending out subpoenas for document production and potentially seeking witness testimony.

As of Tuesday, multiple subsidiaries of the Trump Organization received subpoenas as well as numerous members of the federal government.

This is one of numerous cases brought in federal court against Trump regarding his relationship between Trump International Hotel and foreign governments that has made it to the discovery stage.