A pair of top Republicans in Congress issued a subpoena for records they say might detail a criminal scheme involving then-Vice President Joe Biden and a foreign national—a claim the White House characterized as "unfounded" and motivated by political bias.

Iowa Senator Chuck Grassley and Kentucky Representative James Comer on Wednesday issued a subpoena with the Federal Bureau of Investigation (FBI) seeking an unclassified record called an FD-1023 form that they say allegedly details an arrangement involving an exchange of money for policy decisions.

"The information provided by a whistleblower raises concerns that then-Vice President Biden allegedly engaged in a bribery scheme with a foreign national," Comer said in a statement announcing the subpoena. "The American people need to know if President Biden sold out the United States of America to make money for himself. Senator Grassley and I will seek the truth to ensure accountability for the American people."