Mueller's team has been looking into claims that Roger Stone knew WikiLeaks was going to release emails from the Democratic National Committee and Trump's Democratic opponent Hillary Clinton's campaign chairman, John Podesta. Stone has said he had no prior knowledge of the WikiLeaks releases, CNN reported.
Trump had told Mueller's investigation that Stone and he never spoke about WikiLeaks, CNN reported.
As for the other matter -- the meeting that happened during the campaign at Trump Tower, where Trump's son, Don Jr., learned what Russian operatives had on Clinton -- the younger Trump has said he did not tell his father about the meeting before it happened, CNN reported.
The written responses give Trump some leeway regarding if or when an in-person interview could be held between him and a member of Mueller's investigation, while still getting Trump on the record, the AP reported.