Special Counsel Robert Mueller is preparing to accelerate his probe into possible collusion between Donald Trump’s presidential campaign and Russians who sought to interfere in the 2016 election, according to a person familiar with the investigation.

Mueller and his team of prosecutors and investigators have an eye toward producing conclusions — and possible indictments — related to collusion by fall, said the person, who asked not to be identified. He’ll be able to turn his full attention to the issue as he resolves other questions, including deciding soon whether to find that Trump sought to obstruct justice.