towards democrats, but also former white house counsel john dean, calling him a loser for many years. as we've been talking about, wolf, dean has been testifying today on capitol hill about president trump and how findings in mueller's obstruction probe has parallels with president nixon and watergate. >> the last time i appeared before your committee was july 11, 1974. >> tonight, former white house counsel to president nixon testifying before the house judiciary committee. saying trump's former white house counsel, don mcgahn, should testify too. >> mr. mcgahn represents not donald trump, but the office of the president. his client is the office of the president. and i think he owes that office his testimony before this committee. >> reporter: john dean, a cnn contributor, whose testimony in the watergate investigation helped topple richard nixon's presidency, telling congress there are many similarities between trump and nixon. >> in many ways, the mueller