A woman impersonated the wife of a GOP lawmaker and used counterfeit credentials to gain access to the Republican retreat on the same day President Donald Trump, Vice President Mike Pence met in Philadelphia, according to CNN.
Information about the security breach emerged as the nonprofit Congressional Institute, which organizes the GOP retreat, began looking into how audio from the event was leaked to the press.
"The Congressional Institute is continuing to investigate this breach in order to fully understand how it happened and to ensure it does not happen again," institute president Mark Strand said in an email obtained by the Associated Press.
Strand did not say, however, that the unauthorized woman was the same person who leaked audio to The Washington Post. His letter to lawmakers stressed that Capitol Police have not released the intruder's name or details about how she got into the building.
Strand wrote that the woman entered the gathering at the Loews Hotel between 7:30 a.m. ET and 6:30 p.m., when she was escorted out. He added that she "misrepresented" herself on multiple occasions, claiming to be the spouse of a member of Congress.
CNN reports that most of the policy sessions during the retreat were for members of Congress only, but spouses were allowed to attend the lunch with Trump and Pence.
Rep. Cathy McMorris Rodgers (R-Wash.) spoke out, calling the leak "unacceptable."
The leaked audio
In the leaked audio, lawmakers can be heard discussing the ramifications of overhauling the health care law.
"We'd better be sure that we're prepared to live with the market we've created," Rep. Tom McClintock (R-Calif.) said, according to The Post. "That's going to be called 'Trumpcare.' Republicans will own that lock, stock and barrel, and we'll be judged in the election less than two years away."
The Associated Press contributed to this report.