Investigators working for Robert Mueller, the special counsel probing Russian interference in the 2016 election, are looking into contacts between White House adviser and President Donald Trump’s son-in-law Jared Kushner and foreign heads of state, the Wall Street Journal reported late Tuesday.

The Wall Street Journal reported, citing unnamed sources familiar with the matter, that Mueller’s investigators have questioned witnesses about Kushner’s involvement in a United Nations resolution condemning Israel’s settlements in disputed territories.

A day before the United Nations security council unanimously passed the resolution, Trump said it “should be vetoed.”

The Wall Street Journal reported that Kushner and Trump’s former chief adviser Steve Bannon were both involved in Israeli officials’ outreach to Trump’s administration regarding the resolution.

Investigators are also making inquiries about Kushner’s meeting in December 2016 with Sergey Gorkov, the head of a Russian state-owned bank that has deep connections to Russia’s intelligence agency, according to the report. The United States added the bank in question, Vnesheconombank, to its list of sanctioned entities in 2014.

As the Wall Street Journal noted, it was not immediately clear why Mueller’s investigators are looking into the matter, and such questions “don’t necessarily indicate suspicion.”