An attorney for President Donald Trump’s personal lawyer Michael Cohen was provided secret information about House Intelligence Committee testimony from another committee witness, a sign of the growing discord engulfing the Russia investigation, according to a source with direct knowledge of the matter.

In December, an attorney for David Kramer — an associate to Sen. John McCain who had met with former British intelligence agent Christopher Steele — sent a letter to the House Intelligence Committee accusing the committee’s Republicans of leaking information about Kramer’s December testimony to the attorney of another witness.

The attorney, Larry Robbins, was referencing a conversation with Cohen’s attorney Stephen Ryan in which Ryan brought up Kramer’s testimony, according to the source. After the conversation, Robbins sent the committee a letter demanding to know why a committee official had shared secret testimony with another lawyer, but instead his client was subpoenaed by House Intelligence Chairman Devin Nunes to return before the committee on short notice.