Washington (CNN) Subpoenas have been served on the Trump Organization and a dozen linked entities in a lawsuit challenging President Donald Trump's ongoing business ties while in office.

The office of District of Columbia Attorney General Karl Racine said Wednesday that it "can confirm that all of the Trump Organization entities have been served." Additionally, subpoenas are being served to the state of Maine, the attorney general's office said.

The lawsuit by DC and Maryland claims Trump is in violation of the Constitution's ban on emoluments, or payments, from foreign or domestic government entities to the President because of his continued interest in the Trump International Hotel.

DC and Maryland have said the Trump International Hotel's operations put other nearby hotels and entertainment properties at a competitive disadvantage, and that the Trump hotel got special tax concessions. The hotel won its lease on federally owned property before Trump's election.

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