Top Democrats are urging the FBI to investigate a Trump campaign donor who is the founder and onetime owner of a spa that has been implicated in a human-trafficking ring.

In a Friday letter to the FBI, Democrats on the House and Senate judiciary and intelligence panels wrote that reports about Li Yang “raise serious counterintelligence concerns.” Yang’s company claimed it could provide Chinese clients with a chance to mingle and take photos with President Donald Trump, along with access to his private club in Palm Beach.