Special Counsel Robert Mueller’s team is asking witnesses pointed questions about whether Donald Trump was aware that Democratic emails had been stolen before that was publicly known, and whether he was involved in their strategic release, according to multiple people familiar with the probe.

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.