The former top White House ethics lawyer from President Obama's White House accused President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE on Wednesday of holding an "illegal" fundraiser at the Trump International Hotel in Washington.

Former special ethics counsel Norm Eisen argued in a series of tweets that the reelection fundraiser — Trump's first since taking office — violates the emoluments clause of the Constitution because it is held at one of the hotels owned by a Trump company.

1/ Trump Hotel fundraiser is illegal. His benefitting from leasing this US property violates the domestic emoluments clause of US Const. — Norm Eisen (@NormEisen) June 29, 2017

2/ And the government's refusal to enforce hotel lease term which prohibits him from operating hotel ALSO makes 2nite an illegal emolument — Norm Eisen (@NormEisen) June 29, 2017

3/ So anytime he profits from the hotel, as he is doing tonight, he is violating the domestic emoluments clause. — Norm Eisen (@NormEisen) June 29, 2017

4/ Trump monetizes his office constantly. But tonight a new low: he's collecting cash from being president, from hotel, &from his party. — Norm Eisen (@NormEisen) June 29, 2017

5/5 All in violation of the constitution. Maybe that's why he yanked the press pool at the last minute? Well WE SEE YOU -- in court that is — Norm Eisen (@NormEisen) June 29, 2017

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The clause bars the president from receiving any payment or gift from the federal government on top of his salary.

Trump International Hotel is located in the Old Post Office Building, just blocks away from the White House, and is leased by the Trump Organization from the General Services Administration, the federal agency that essentially acts as the government's landlord.

Eisen argued that by allowing Trump to hold a fundraising event for his personal reelection campaign at the hotel, he is violating both the emoluments clause and the terms of his real estate company's lease with the federal government.

Trump's D.C. hotel has been a source of controversy for the president in the past, particularly over whether foreign officials and dignitaries could patronize the hotel to curry favor in Trump's White House.