Trump provides written responses to Mueller questions

Mueller left open the possibility that he would follow up with additional questions on obstruction, though Trump's lawyers - who had long resisted any face-to-face interview - have been especially adamant that the Constitution shields him from having to answer any questions about actions he took as president.

Trump's lawyers say it's time for the investigation to end, but Mueller's team may well press for additional information.

Trump attorney Jay Sekulow offered no details on the current Q&A, saying merely that "the written questions submitted by the special counsel's office ... dealt with issues regarding the Russia-related topics of the inquiry. The president responded in writing." He said the legal team would not release copies of the questions and answers or discuss any correspondence it has had with the special counsel's office.

Another of Trump's lawyers, Rudy Giuliani, said the lawyers continue to believe that "much of what has been asked raised serious constitutional issues and was beyond the scope of a legitimate inquiry." He said Mueller's office had received "unprecedented cooperation from the White House," including about 1.4 million pages of materials.

"It is time to bring this inquiry to a conclusion," Giuliani said.

The president told reporters last week that he had prepared the responses himself.

Trump said in a Fox News interview that aired Sunday that he was unlikely to answer questions about obstruction, saying, "I think we've wasted enough time on this witch hunt and the answer is, probably, we're finished." Trump joins a list of recent presidents who have submitted to questioning as part of a criminal investigation.