The U.S. Secret Service on Thursday will give a classified briefing to members and staff of the Republican-led House Oversight Committee on the cocaine found in the White House West Wing earlier this month, a spokesman for the agency confirmed to ABC News.

Committee chair James Comer, R-Ky., said the discovery raises questions about security at the White House when he requested the briefing in a letter sent to Secret Service Director Kimberly Cheatle on July 7.

"This alarming development requires the Committee to assess White House security practices and determine whose failures led to an evacuation of the building and finding of the illegal substance," Comer wrote.

The briefing will take place behind in a SCIF -- a sensitive compartmented information facility used to handled classified information -- and will start at 10 a.m. ET, according to a source familiar with the situation.... Read More: WBAL