mayor of new york, he is also the former u.s. attorney for the southern district of new york. the very u.s. attorney's office that ordered the fbi raid on the president's personal lawyer, michael cohen. giuliani is also a political bulldog. >> i am sick and tired of the defamation of donald trump by the media and by the clinton campaign. i am sick and tired of it. this is a good man. >> reporter: the giuliani hire comes as the president has turned up the heat on special counsel robert mueller, escalating his attacks on an investigation he calls a witch hunt. but today, giuliani told "the washington post" he has "high regard" for mueller, saying, "i hope we can negotiate an end to this for the good of the country." as for what he'll tell the president, giuliani says, "my advice on mueller has been this. he should be allowed to do his job, he's entitled to do his job." >> so, let's get right to jon