By ELLEN KNICKMEYER (Associated Press)

WASHINGTON (AP) — The head of the House Intelligence Committee said Wednesday he had information about a serious national security threat and urged the administration to declassify the information so the U.S. and its allies can openly discuss how to respond.

Rep. Mike Turner, an Ohio Republican, gave no details about the nature of the threat in his statement. The White House also declined to provide details.

Turner earlier Wednesday sent an email to members of Congress saying his committee had “identified an urgent matter with regard to a destabilizing foreign military capability” that should be known to all congressional policy makers. He encouraged them to come to a SCIF, a secure area, to review the intelligence. He again provided no details.

Turner’s announcement appeared to catch the Biden administration off-guard.

National security adviser Jake Sullivan told reporters at the White House that he already had been due to brief Turner and other senior congressional intelligence leaders, known as the Gang of Eight, on Thursday. Sullivan did not disclose the topic or provide any other details related to Turner’s statement.

“I’m focused on going to see him, sit with him as well as the other House members of the Gang of Eight, tomorrow,” Sullivan said. “And I’m not in a position to say anything further from this podium at this time.”

He acknowledged it was not standard practice to offer such a briefing.

“I’ll just say that I personally reached out to the Gang of Eight. It is highly unusual, in fact, for the national security adviser to do that,” Sullivan said. He said he had reached out earlier this week.

He would not say whether the briefing was related to Turner’s warning. “I leave it to you to draw whatever connections you want,” he told reporters.