The Washington Post reports that Jared Kushner wanted to set up a secret communications channel between President Trump's transition team and the Kremlin that would be free of monitoring. He wanted the secret channel to discuss policy issues and Syria with Russia, according to three officials who spoke with the NYT.
What we know: Kushner requested on Dec. 1 or 2 that the secret channel be set up during a meeting with Kislyak at Trump Tower — a meeting also attended by Michael Flynn, Trump's first national security adviser. Kushner wanted to use Russian diplomatic facilities for the proposed meetings. They also discussed setting up a meeting between a Trump associate and a Russian contact in a third country.
Update: Once Rex Tillerson was confirmed as Secretary of State, Trump's team felt there was no need for a backchannel, per an AP report, which confirmed Kushner made the request. The AP, like the NYT, reports that the channel was meant to connect Flynn with military leaders.