Mueller is investigating whether members of Trump's campaign conspired with Moscow in the 2016 election and whether Trump has unlawfully sought to obstruct the probe, which has clouded his presidency.
"I've answered them very easily".
The questions, which focus on the collusion allegation and not issues of obstruction of justice, were the product of grueling negotiations on whether Mr. Trump would testimony.
"I'm sure they are tricked up because they like to catch people - was the weather sunny or rainy", Trump said Friday of the questions.
The Republican president did not specify when his legal team would give Mueller his written responses, but a person familiar with the matter told Reuters they likely would be submitted next week. Everyone has to be careful with questions designed "by people who probably have bad intentions", he also said. "Now, the questions were very routinely answered by me".
"There should have never been any Mueller investigation" he said Friday.
The president did not say when he would turn over the answers to Mueller.
Trump added that he "just finished" the questions but has yet to submit them to the special counsel. "I imagine it's ending now", he said.
Trump's former national security adviser, onetime campaign chair and personal attorney have all agreed to plead guilty to various charges, as have two others from his campaign team, following investigations launched by the special counsel.
The president last week fired Attorney General Jeff Sessions and replaced him on an interim bases with Matthew Whitaker, Sessions's chief of staff.
These included sections relating to both former national security adviser Michael Flynn, former FBI Director James Comey, former Attorney General Jeff Sessions, and questions about possible coordination between the Trump campaign and Russian Federation. "They have found no collusion and have gone absolutely nuts", Trump tweeted.
On Thursday the president let loose a tirade against Mueller on Twitter, alleging the investigation by the former FBI director was politically biased and had used threats against witnesses.