In a blow to President Trump, a federal judge says a lawsuit that alleges Trump's business interests violate the Constitution can proceed.
Federal District Judge Peter Messitte denied the Department of Justice's request to dismiss a case brought by the attorneys general of Maryland and the District of Columbia. The Emoluments Clause bars any president from personally profiting from his dealings with foreign governments — or even U.S. state governments.
https://www.npr.org/2018/07/25/632300960/federal-lawsuit-against-president-trumps-business-interests-allowed-to-proceed
IMNSHO, this case is the one that may make Drumpf ultimately decide to resign. I can't imagine that he would choose to remain in office over retaining control of his many enterprises.