Former secretary of state Rex Tillerson spoke with the leaders of the House Foreign Affairs committee on Tuesday in a lengthy session that, an aide said, touched on his time working in the Trump administration, the frictions he had with the president’s son-in-law, and efforts to tackle issues like Russian interference in the 2016 election.

Tillerson’s appearance, first reported by The Daily Beast, took place as virtually every other Trumpworld luminary has been stonewalling congressional oversight efforts. At the same time the former secretary of state was speaking before lawmakers, former White House counsel Don McGahn was ignoring a subpoena to testify in front of the House Judiciary Committee.

Tillerson’s arrival at the Capitol was handled with extreme secrecy. No media advisories or press releases were sent out announcing his appearance. And he took a little-noticed route into the building in order to avoid being seen by members of the media.

Tillerson reached out to the committee and expressed a willingness to meet, a committee aide said. In a more than six-hour meeting, he told members and staffers that the Trump administration actively avoided confronting Russia about allegations of interference in the election in an effort to develop a solid relationship with the Kremlin, a committee aide told The Daily Beast.

Tillerson also told members and aides that he had tried to establish a formal and disciplined interagency process at the State Department whereby the president could receive informed briefings on sensitive foreign policy matters, the aide said. That effort never manifested, Tillerson told the committee, in part because of the president’s management style, but also because of interference from other aides.

Tillerson told the committee that the president’s son-in-law, Jared Kushner, at times impeded his ability to communicate effectively and introduce to President Trump policy proposals developed by State Department experts on major foreign affairs matters across the globe, not just in the Middle East. Kushner, a White House adviser, has publicly focused much of his international efforts on the Middle East and is set to unveil a Middle East peace plan in the coming weeks.

Tillerson had a notoriously prickly relationship with the president, reportedly calling him a “moron” in private. But he was present during critical moments of the administration, including Trump’s private 2017 meeting with Russian President Vladimir Putin in Hamburg, Germany.

Since leaving his post, Tillerson has rarely made public appearances, save for speaking at a panel in Houston in December. During that appearance, he said there was “no question” Russia interfered in the 2016 presidential election.

“So often, the president would say, ‘Here’s what I want to do and here’s how I want to do it,’ and I would have to say to him, ‘Mr. President I understand what you want to do but you can’t do it that way. It violates the law,’” Tillerson said.

Tillerson’s interview by House Foreign Affairs Committee Chairman Eliot Engel (D-NY) and ranking member Michael McCaul (R-TX)  comes a month after special counsel Robert Mueller published his report on Russian interference in the 2016 presidential election. Since then, top Democrats on the Hill have demanded that Attorney General Bill Barr and Mueller answer questions related to the report and its publication. Barr has declined to testify before the House, citing the insistence of the committee that staff lawyers be allowed to conduct some of the questioning. Mueller is reportedly in negotiations to testify, though the Department of Justice had previously not agreed on a date for him to do so.

On Tuesday, CNN reported that Mueller’s team had expressed reluctance about the possibility of a testimony taking place in public for fear that it would appear political.

This story has been updated with additional reporting.