Top Democrats in both the House and Senate are seeking criminal and national security investigations into a shadowy woman who is tied to prostitution, human trafficking, and apparently has been selling access to Donald Trump to foreign nationals.

The woman’s name is Li “Cindy” Yang, and according to reports cited in a letter written by several top Democratic lawmakers, Yang operated message parlors in Florida which used immigrant women as sex workers.

In addition, Yang apparently also operates an enterprise which seemingly is selling access to Trump, to Chinese national businessmen.

On Yang’s company website, since taken down, she offers the opportunity to meet with the president and other top administration officials. On at one occasion, in 2017, Yang arranged for Chinese businessmen to meet with Trump at a New York fundraiser.

Yang also is a frequent guest at Trump’s Mar-a-Lago estate in Florida, attended 2019 Super Bowl party with Trump and has visited the White House at least once, the lawmakers said.

“If true, these allegations raise serious counterintelligence concerns,” the lawmakers wrote. “China has frequently used non-traditional intelligence collectors and businesspersons to compromise targets.”

The letter to the directors of the FBI, national intelligence agencies, and Secret Service requesting criminal and counterintelligence investigations of Yang was signed by House Intelligence Committee Chairman Adam Schiff, House Judiciary Committee Chairman Jerrold Nadler, Senate Intelligence Committee Vice Chairman Mark Warner and Senate Judiciary Committee ranking Democrat Dianne Feinstein.

Following the release of the letter, House Speaker Nancy Pelosi and Senate Democratic Leader Chuck Schumer released a joint statement: “The facts in this situation are very concerning, and we urge [FBI] Director [Christopher] Wray to adhere to the joint bicameral requests of the Democratic Senate ranking members and Democratic House chairmen and start an investigation.”