Sen. Ron Wyden, D-Ore., has requested the Trump administration release names of people who have visited Trump's private clubs and the identities of his golfing partners, following an investigation that revealed lobbyists and contractors pay Trump's companies for membership access to his private golf clubs.

Although the membership lists of Trump's clubs are not available to the public, USA Today conducted a review of social media and a website used by golfers to track their handicaps. They discovered approximately 4,500 members and then researched if the individuals conducted business with the government.

The findings revealed at least 50 executives whose companies hold federal contracts and 21 lobbyists and trade group officials are members of Trump's golf clubs. Based on scores posted online, USA Today was able to determine two-thirds of these members played while Trump was visiting the club.

As a result, Wyden submitted a letter Thursday to Department of Homeland Security's acting secretary, Elaine Duke.

"The story raised the possibility that members of the president's private clubs could receive special access to the president not available to private citizens," he wrote.

Wyden requested the administration provide information including a log of all visitors to his clubs since he assumed office, names of everyone who has golfed with the president, list of foreign club members and visitors or those who have connections to state-owned enterprises, and names of those who required a Secret Service screening.

Wyden wants a response by Oct. 13.