interview is an important part of the probe. the white house says it is cooperating. >> robert mueller's team also reportedly interested in why the president asked fbi director andrew mccabe who he voted for in the 2016 election. mccabe was the acting director at the time of the discussion according to a report first reported by the "washington post" and then "the new york times." the president and mccabe met in the oval office shortly after the president fired james comey. >> mccabe described the exchange as disturbing. he reportedly told the president he didn't vote. after declining comment to the "post," the white house told the "times" mr. trump did ask the question. a white house official tells the "times" it happened after trump asked mccabe about his family, with the discussion pivoting to politics and mccabe wife. his wife ran for virginia state senate as a democrat. >> and received $500,000 in donations from a pac tied to terry mcauliffe, a clinton ally. the fbi is not commenting.