The Senate Intelligence Committee has concluded that Republicans on the House Intelligence Committee were behind the leak of private text messages between the Senate panel’s top Democrat and a Russian-connected lawyer, according to two congressional officials briefed on the matter.

Senator Richard M. Burr of North Carolina, the committee’s Republican chairman, and Senator Mark Warner of Virginia, the top Democrat, were so perturbed by the leak that they demanded a rare meeting with Speaker Paul D. Ryan last month to inform him of their findings. They used the meeting with Mr. Ryan to raise broader concerns about the direction of the House Intelligence Committee under its chairman, Representative Devin Nunes of California, the officials said.

To the senators, who are overseeing what is effectively the last bipartisan investigation on Capitol Hill into Russia’s interference in the 2016 election, the leak was a serious breach of protocol and a partisan attack by one intelligence committee against the other.

………

The messages between Mr. Warner and Adam Waldman, a Washington lawyer, show that the senator tried for weeks to arrange a meeting with Christopher Steele, the former British spy who assembled a dossier of salacious claims about connections between Mr. Trump, his associates and Russia. The Senate committee has had difficulty making contact with Mr. Steele, whom it views as a key witness. And Mr. Waldman, who knew Mr. Steele, presented himself as a willing partner.

………

Fox News published the texts, which were sent via a secure messaging application, in early February. President Trump and other Republicans loyal to him quickly jumped on the report to try to discredit Mr. Warner, suggesting that the senator was acting surreptitiously to try to talk to Mr. Steele.

………

Copies of the messages were originally submitted by Mr. Waldman to the Senate committee. In January, one of Mr. Nunes’s staff members requested that copies be shared with the House committee as well, according to a person familiar with the request who was not authorized to talk about it publicly. Days later, the messages were published by Fox News, the person said. Fox’s report said that it had obtained the documents from a Republican source it did not name.

The documents published by Fox News appear to back up the senators’ accusation. Though they were marked “CONFIDENTIAL: Produced to USSSCI on a Confidential Basis,” suggesting that they had come from the Senate panel, known as the United States Senate Select Committee on Intelligence, the person familiar with the congressional requests said that the stamp was misleading and that other markings gave away their actual origin.

Specifically, the copy of the messages shared with the Senate had page numbers, and the one submitted to the House — while preserving the reference to the Senate committee — did not.

A lawyer for Mr. Waldman independently concluded that the House committee had probably shared the document and sent a letter to Mr. Nunes complaining about the leak, according to a person familiar with the letter.

I have my suspicions about who leaked the texts **cough** Nunes **cough**, but regardless of who did, this sort of rat-f%$#ing between the House and Senate is really unprecedented.