A group including former White House ethics attorneys will file a lawsuit on Monday accusing President Donald Trump of allowing his businesses to accept payments from foreign governments, in violation of the U.S. Constitution.

The lawsuit, brought by the Citizens for Responsibility and Ethics in Washington, will allege that the Constitution's emoluments clause forbids payments to Trump's businesses. It will seek a court order forbidding Trump from accepting such payments, said Deepak Gupta, one of the lawyers working on the case.

Trump does business with countries like China, India, Indonesia and the Philippines, the group noted in a statement.

"When Trump the president sits down to negotiate trade deals with these countries, the American people will have no way of knowing whether he will also be thinking about the profits of Trump the businessman," it said.

The case is part of a wave of litigation expected to be filed against Trump by liberal advocacy groups.

The impending lawsuit was earlier reported by the New York Times.