The House Intelligence Committee’s report from its Russia investigation published on Friday revealed another meeting former National Security Adviser Michael Flynn had with the Russian ambassador before he joined the Trump campaign.

Flynn and his son, Michael Flynn, Jr., met with Ambassador Sergey Kislyak at his Washington, D.C. residence on December 2, 2015, according to emails reviewed by the House Intelligence Committee. Flynn’s son described the meeting as “very productive” in an email to the Russian embassy, according to the committee’s report. According to the report, “emails indicate that the meeting was arranged at the request of General Flynn or his son.” Neither Flynn sat with the committee for an interview, leaving congressional investigators with few details about the rendezvous.

The meeting with Kislyak took place about a week before Flynn traveled to Moscow to speak at the Kremlin RT news organization’s annual gala. Flynn sat next to Vladimir Putin at the dinner and was paid by RT to attend the event.

Flynn’s December 2015 meeting with Kislyak also came after he met with President Donald Trump for the first time, but Flynn did not formally join the campaign until 2016.

Flynn resigned as Trump’s first national security adviser in February 2017 after it became clear that he discussed Russian sanctions with Kislyak in late 2016 before Trump took office and allegedly lied to Vice President Mike Pence about it.

He then pleaded guilty in December 2017 to lying to the FBI about his conversations with Russian officials. Flynn is now cooperating with special counsel Robert Mueller’s investigation.