WASHINGTON, DC (CVILLE RIGHT NOW) – Virginia U.S. Senator Tim Kaine, a member of the Senate Armed Services and Foreign Relations Committees, and 13 of his Senate colleagues sent a letter to President Donald Trump Monday demanding answers about several Cabinet officials’ accidental adding of a reporter to an unsecured group chat where secret, high-level military planning was occurring. The chat was about air attacks on Houthi rebels in Yemen. Kaine says that’s in violation of security protocols and potentially in violation of the law.

The Senators’ letter reads they’re “gravely concerned by appalling reports that senior officials of your Administration, including the Vice President, the Secretary of Defense, and other Cabinet members, coordinated military strikes in Yemen over the commercial and unclassified messaging application Signal.”

He said they’re “even more concerned by the fact that a reporter was included on the same Signal chat,”

Among answers they’re demanding are what disciplinary action will be taken, what remedial action was taken to limit damage following this disclosure, and what other sensitive military operations have been coordinated by your administration via Signal.