Mueller's investigators have asked witnesses whether Trump was aware of plans for WikiLeaks to publish the emails. They have also asked about the relationship between GOP operative Roger Stone and WikiLeaks founder Julian Assange, and why Trump took policy positions favorable to Russia.
In one line of questioning, investigators have focused on Trump's public comments in July 2016 asking Russia to find emails that were deleted by his then-opponent Hillary Clinton from a private server she maintained while secretary of state. The comments came at a news conference on July 27, 2016, just days after WikiLeaks began publishing the Democratic National Committee emails. "Russia, if you're listening, I hope you're able to find the 30,000 emails that are missing," Trump said.