Republican senators Chuck Grassley (IA) and Ron Johnson (WI) are expanding their long-running probe of the Biden family. The senators are demanding a complete list of everyone with access to the classified documents that have engulfed President Biden in fresh controversy.

The senators requested the information from Secret Service no later than February 2, the Washington Examiner reported.

Visitor logs demanded

The White House has asserted that no visitor logs are available, but the Secret Service has said it keeps background information on those who "may come into contact with Secret Service protected sites."

In a letter to the agency, Johnson and Grassley demanded a complete record of all visitors at the locations where Biden records have been found.

"Accordingly, as part of our ongoing congressional investigation, we request that no later than February 2, 2023, the Secret Service provide a full and complete list of all individuals who entered the locations where classified records relating to then-Vice President Biden’s tenure have been identified."

Who had access?

The first set of documents was found at a think tank named after Biden that has alleged ties to communist China, where Hunter Biden is known to have pursued lucrative business deals.

One of those ventures was with a Chinese state-backed energy company that paid out millions to Hunter and his uncle James Biden. Joe Biden was notoriously referenced as "the big guy" in context of that deal.

Around the same time, Hunter Biden was living in Biden's home in Delaware, where additional classified documents have been found.

The Biden White House has come under scrutiny for a lack of transparency over its discovery and handling of the classified documents, some of which are said to address Ukraine, Iran, and Britain.

Hunter Biden connection

For years, Grassley and Johnson have led the Senate GOP's investigation of Hunter Biden's overseas business deals in countries like China and Ukraine.

Johnson said that Biden "arrogantly doesn’t believe the rules and laws apply to him."

"The public deserves a full accounting of individuals that may have had access to these classified records," he told the Examiner. 

Republicans are also making use of their newfound power in the House of Representatives to dig into Biden's document controversy and its potential connection to the Hunter Biden scandal.

House Oversight Chairman James Comer (KY) has requested visitor logs and a list of Chinese donors to the University of Pennsylvania, which has ties to the Penn Biden Center.