In the latest development surrounding Robert Mueller’s Trump-Russia investigation, White House senior adviser Jared Kushner has turned over documents to special counsel Robert Mueller as investigators have begun asking in witness interviews about Kushner’s role in the firing of FBI Director James Comey.

Citing sources familiar with the matter said, CNN reports that Mueller’s investigators have set their focus in the president’s son-in-law as part of its probe into Russian meddling, including potential obstruction of justice in Comey’s firing.

Their questions about Kushner signal that Mueller’s investigators are reaching the President’s inner circle and have extended beyond the 2016 campaign to actions taken at the White House by high-level officials.

Sources close to the White House say that based on their knowledge, Kushner is not a target of the investigation. But Mueller’s actions suggest otherwise, notes CNN.

Two separate sources told the news network that investigators have asked other witnesses about Kushner’s role in firing Comey. Investigators have also asked about how a statement was issued in the name of Donald Trump Jr. regarding a Trump Tower meeting and about the circumstances surrounding the departures of other White House aides, according to one source.

At the heart of the matter is the fact that Kushner attended the June 2016 meeting at Trump Tower between top Trump campaign officials and a cadre of Russian figures, including some with links to the Kremlin. It was arranged after Trump Jr. was told that the Russian government wanted to pass along damaging information about Democratic presidential nominee Hillary Clinton as part of its pro-Trump efforts. The meeting was also attended by Paul Manafort, who was Trump’s campaign chairman.

The question of whether — or just how much — Kushner influenced the President’s decision to fire Comey is a matter of dispute among those in Trump’s orbit. White House sources say it was the President alone who made that decision after watching Comey’s congressional testimony May 3. While Kushner and those close to the White House will only say he was in favor of the decision — or, in the words of one attorney, “did not oppose it” — but there are multiple sources who say that Kushner was a driver of the decision and expected it would be a political boon for the President.

Even before Mueller took over, the FBI had been looking at Kushner’s multiple roles on both the Trump campaign and the Trump transition team. The 2016 Trump Tower meeting, in addition to sessions with Russia’s ambassador and a Russian banker, were left off Kushner’s security clearance forms, which had to be revised multiple times. ShareTweet