A thorough reading of the Manafort indictment shows evidence that Manafort was conspiring (use the non legal word “colludeding” if you like) with Russian oligarchs via email to impact the election, Republican policies like the platform, and to impact Trump’s policies with respect to Russia. Mueller likely has more information on Manafort and why he took the position he did for free (when he had financial problems in Russia and Eastern European countries). Mueller is also the person identified in the Popodoupulous indictment who encouraged him to meet with or conspire with Russia regarding obtaining emails and “dirt” on Hillary to interfere in the election (a Federal Crime).