Mueller will not indict the President. But, he will issue a report and it will become public, either through a decision of the AG or through a leak. This report will be largely written by Andrew Weismann and will attempt to achieve the ultimate goal of the Special Counsel, to remove Donald Trump from the Office of President by hook or crook. The report will not be a legal document, it will be a diatribe of unsupported accusations designed to persuade the American public and their wobbly kneed political representatives to throw the Donald out of the White House. It will not be fair, it will not contain much truth, and it will be a blatant political assassination using all of the dirty tricks known by both Mueller and Weismann. It will be nasty and ugly.
Maybe Weissmann has told Elizabeth Warren that the report will ensure that President Trump will be in prison before November 2020, causing her to make that statement.
What makes you think the seditious leftists can pull off an impeachment without risking their lives, pensions and fortunes?