"We treated both David Wildstein and Bridget Kelly exactly the same. They deserved the assessment that we gave both of them about their personal conduct and about their actions, exactly the same way, because they violated the public trust. And that’s what the evidence showed," Mastro said on ABC's "This Week."
Mastro said it was "obvious" that Kelly had an ulterior motive, but couldn't say why when asked by "This Week" host George Stephanopoulos.
"We can’t establish what the ulterior motive is because we didn’t have the chance to question Kelly and Wildstein," Mastro said.
Christie's attorney also said that he was confident his report would not be contradicted by the investigation conducted by the U.S. attorney's office.
"We had no incentive to do anything other than to get to the truth," Mastro said.