This is not the first federal lawsuit to accuse the president of violating the emoluments clause of the constitution, but the case is novel. The Constitution also bars a president from accepting economic benefits from federal or state governments, other than a basic salary.
But Racine and Frosh told the Post on Sunday that Trump had broken promises to separate himself from his business interests, the Post said, noting that the president receives regular updates on his company's finances.
Donald Trump is facing lawsuits from the attorney generals of Maryland and the District of Columbia alleging the the US President committed "unprecedented constitutional violations" by refusing to sell off his businesses.
After the CREW lawsuit was filed, the Trump Organization said that Trump, a New York-based real estate mogul and investor, had relinquished all involvement in his businesses.
Trump already faces a similar lawsuit brought in January by plaintiffs that include an ethics group, a restaurant group and a hotel events booker.
The lawsuit focuses on the fact that the president opted to keep ownership of his businesses when he was elected.
The lawsuit also asserts that since Trump made a decision to maintain his financial interests in his global business empire, he is committing "unprecedented constitutional violations" by accepting those payments.
The Justice Department on Friday argued in the other emoluments lawsuit filed in January that the plaintiffs lacked legal standing to sue because they can not allege enough specific harm caused by Trump's businesses.
White House spokesman Sean Spicer denied Trump was in violation of the clause.
The suit asks for a "declaratory judgement" that Trump has violated the emoluments clauses and that he will continue to do so until he divests entirely from his businesses. Trump said he was shifting assets into a trust managed by his sons to eliminate potential conflicts of interests.
In addition, the suit says states have standing to sue because they entered a contract, the Constitution, that prohibits the president from receiving emoluments.
Brian E. Frosh, the Maryland attorney general, and Karl Racine, the attorney general for the District of Columbia, said that they are seeking to obtain the president's tax returns.
Since then, a nonprofit restaurant group, a NY hotel and restaurant owner, and a woman who books events at hotels in Washington have joined the suit as plaintiffs.
During a press conference about the lawsuit Monday afternoon, Racine noted the view of the Trump International Hotel from his office window and said he knows exactly what's going on there.