Senator Tom Cotton (R., Ark.) sent a letter to the Secret Service Wednesday demanding answers about the white powder, later confirmed to be cocaine, that was discovered in the West Wing of the White House.

Cotton, the ranking member of the Subcommittee on Criminal Justice and Counterterrorism, explained his rationale for probing the agency that protects high-ranking politicians such as President Joe Biden: “If the White House complex is not secure, Congress needs to know the details, as well as your plan to correct any security flaws.” He added that the American people deserve to know why an illicit drug was found in an area where confidential information is exchanged.

The Arkansas senator asked how many times the Secret Service has discovered illegal drugs at the White House complex in the last five years. Citing the U.S. Code, Cotton noted that the Secret Service has the authority “to make arrests without warrant for any offense against the United States committed in their presence” or any felony. “If the Secret Service discovers the identity of the individual who brought illicit cocaine into the White House complex, will they make an arrest under this provision?” asked Cotton.

The senator also demanded a list of all individuals who have access to the White House complex but are subject to limited or no security screening.

White House Press Secretary Karine Jean-Pierre declined to answer most questions on the illicit substance in a press conference Wednesday. Jean-Pierre said the Secret Service is conducting an investigation, but did note that the substance was found in a “heavily-traveled area . . . where visitors to the West Wing come through.”

Jean-Pierre also said the president has been briefed on the situation.

In his letter, Cotton asked how many visitors to the interior of the White House are screened by the Secret Service’s K-9s, and he also asking for a list of circumstances in which the Secret Service would decline to use the K-9 screening.

Additionally, the tough-on-crime senator asked, “How often does the Secret service audit its security procedures for the White House complex and adjust those procedures to correct potential flaws?”

Cotton demanded his office be briefed on the situation and that answers be provided by Friday at 5 p.m.