what have you learned? >> reporter: we learned the irs is sharing information with investigators working with special counsel robert mueller and this comes after the two sides were at odds for months. they went back and forth over the scope of mueller's investigation into russia meddling. mueller's investigators wanted information we're told on several people associated with the trump campaign. including former trump tam pain chairman paul manafort and michael flynn, the former national security advisor. and we're told by sources, anderson, that the irs had concerns, reservations initialing because of what they saw as far reaching and broad request for information from mueller's investigators. in the case of manafort scope includes financial crimes that date back to january of 2006, ten years before the russian meddling in the russian election last fall. >> your reporting indicates the dispute centers on the july raid of manafort's home.