WATCH: The president spent Friday night thanking patrons at Trump Hotel DC
President Donald Trump shaking hands at Trump International Hotel Washington, DC (screengrab)

The president of the United States spent Friday evening at Trump Hotel Washington DC.

Video shows President Donald Trump walking through his hotel, located in the historic Old Post Office. He was joined by Melania Trump.

Trump thanked his patrons as he shook hands.

In June, U.S. District Judge Emmet Sullivan ruled that a lawsuit could proceed that argues Trump's business interests violate the Emoluments Clause of the Constitution.