Special counsel Robert Mueller’s team of investigators are looking into White House senior adviser and President Trump’s son-in-law Jared Kushner and his contact with foreign leaders, according to a new report.

The Wall Street Journal reports that Mueller’s team is probing Kushner’s involvement in the controversy surrounding a United Nations resolution passed in December 2016 that condemned Israeli settlement construction.

Trump, who was president-elect at the time, called for the U.S. to veto the resolution, saying it was “extremely unfair to all Israelis.”

The U.N. Security Council passed the resolution days later as the U.S. abstained from vetoing it.