Mueller didn’t leak these questions. Here’s the Times story;
“The list of questions grew out of those negotiations. In January, Mr. Trump’s lawyers gave Mr. Mueller several pages of written explanations about the president’s role in the matters the special counsel is investigating. Concerned about putting the president in legal jeopardy, his lead lawyer, John Dowd, was trying to convince Mr. Mueller he did not need to interview Mr. Trump, according to people briefed on the matter.
Mr. Mueller was apparently unsatisfied. He told Mr. Dowd in early March that he needed to question the president directly to determine whether he had criminal intent when he fired Mr. Comey, the people said.
But Mr. Dowd held firm, and investigators for Mr. Mueller agreed days later to share during a meeting with Mr. Dowd the questions they wanted to ask Mr. Trump.
When Mr. Mueller’s team relayed the questions, their tone and detailed nature cemented Mr. Dowd’s view that the president should not sit for an interview. Despite Mr. Dowd’s misgivings, Mr. Trump remained firm in his insistence that he meet with Mr. Mueller. About a week and a half after receiving the questions, Mr. Dowd resigned, concluding that his client was ignoring his advice.”
People briefed on the matter aren’t the Special Counsel or the prosecutors—they know what they have already. Like most Times articles, it comes from the Trump side is my bet, just like most Times articles on HRC emails were sourced to Jason Chaffetz’s subcommitttee in the House.