President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE's son-in-law and senior adviser Jared Kushner has handed over documents to special counsel Robert Mueller in recent weeks.

CNN reported Thursday that Kushner has turned over the documents as Mueller and his team begin looking into the White House adviser's role in Trump's decision to fire former FBI Director James Comey earlier this year.

Kushner is not believed to be a target of Mueller's investigation, CNN reported, citing sources close to the White House.

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Still, that Mueller and his team are asking about Kushner in witness interviews signals that the special counsel investigation into Russia's role in the 2016 election in moving closer to the president's inner circle and is also looking at actions taken by Trump administration officials in the White House.

According to CNN, Kushner turned over documents related to the campaign and the transition, as well as those related to any contacts with Russian officials. He reportedly turned over similar documents to congressional investigators earlier this year.

Kushner has repeatedly emerged in the investigation into Russia's election meddling for his presence at meetings last year with Russian officials and representatives. The Washington Post reported earlier this year that the special counsel was looking into the senior adviser's business dealings and finances.

Kushner held two meetings with Russians in the month before Trump took office — one with former Russian Ambassador Sergey Kislyak and another with Sergey Gorkov, the chairman of a state-owned Russian bank.

It was also revealed in July that Kushner, along with Donald Trump Jr. and then-Trump campaign chairman Paul Manafort, attended a summer 2016 meeting at Trump Tower with a Russian lawyer who had promised dirt on former Democratic presidential candidate Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE.

Kushner has denied any wrongdoing or improper communications with Russia during the 2016 campaign.

It's not clear what role, if any, Kushner played in Comey's firing in May, according to CNN.

In his letter notifying Comey of his termination, Trump cited the recommendations of Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE and Deputy Attorney General Rod Rosenstein, though the president later said that he had decided to fire Comey regardless of their recommendations.