A federal district judge will hear arguments Thursday about whether Democratic lawmakers can pursue a lawsuit over President Donald Trump’s vast business interests and whether he must get congressional approval before accepting payments or gifts from foreign governments.

More than 200 Democrats filed the lawsuit a year ago, in the first months of Trump’s presidency, when their concerns included payments from governments at the Trump International Hotel in Washington and trademarks issued by the Chinese to Trump and his companies.

The issue has gained salience with new revelations in recent weeks. Sen. Richard Blumenthal, the Connecticut Democrat who is leading the lawsuit along with Rep. Jerrold Nadler of New York, pointed Tuesday to Trump’s announcement in May that he wanted to help Chinese telecommunications company ZTE.

That was shortly after a $500 million loan from Chinese state groups went to a development in Indonesia with a Trump hotel and golf course, according to media reports of the arrangement. Blumenthal said the situation epitomizes why the drafters put the “emoluments clause” in Article I, Section 9 of the Constitution.

“They wanted judgments by the president to be made independent of any sort of benefit to him, unless the Congress approves,” Blumenthal said. “And we cannot approve, we cannot consent to, what we don’t know.”