The U.S. State Department allowed seven foreign governments to rent luxury condominiums in New York's Trump World Tower in 2017 without approval from Congress, according to documents and people familiar with the leases, in what some experts say could be a potential violation of the U.S. Constitution's emoluments clause.

The Manhattan building, part of the real estate empire of Donald Trump, had housed diplomats and foreign officials before the property developer became president. But now that he is in the White House, such transactions must be approved by federal lawmakers, some legal experts say. The emoluments clause bans U.S. officials from accepting gifts or payments from foreign governments without congressional consent.

The rental transactions, dating from the early months of Trump's presidency, could add to mounting scrutiny of his business dealings with foreign governments, which are now the subject of multiple lawsuits.