Rep. Ted Lieu (D-Calif.) joked in a tweet Sunday that Jared Kushner could "back-channel" in Siberia if he took a leave of absence from the White House.

"Dear Jared: I have been told that Siberia, Russia has lovely weather this time of the year. You can backpack and back-channel all you want," Lieu wrote in a tweet.

Dear Jared: I have been told that Siberia, Russia has lovely weather this time of the year. You can backpack and back-channel all you want. https://t.co/Qc5pBR8709 — Ted Lieu (@tedlieu) May 28, 2017

The tweet was in response to reports that President Trump's senior adviser and son-in-law is under pressure to take a leave of absence from the White House amid allegations that he tried to set up a direct back-channel line of communication between Moscow and the Trump transition team.

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Lieu is calling for Kushner to be prosecuted after reports that Kushner did not reveal three contacts with Russian officials during and after the 2016 campaign on his security clearance form.