In a letter, David Wildstein's lawyer Alan Zegas said his client "contests the accuracy of various statements that the governor made about him and he can prove the inaccuracy of some."
Wildstein was the former Port Authority official who oversaw the George Washington Bridge lane closings that led to the "Bridgegate" scandal. He was also a former high school friend of Christie.
"Evidence exists as well tying Mr. Christie to having knowledge of the lane closures, during the period when the lanes were closed, contrary to what the Governor stated publicly in a two-hour press conference," Zegas said.
Christie and some of his aides were accused of closing the bridge lanes to punish a mayor in Fort Lee, N.J., for declining to endorse him for reelection.
The Christie administration emphasized in statement that the governor did not know about the lane closures before they happened.
"As the Governor said in a December 13th press conference, he only first learned lanes were closed when it was reported by the press and as he said in his January 9th press conference, had no indication that this was anything other than a traffic study until he read otherwise the morning of January 8th," the administration said. "The Governor denies Mr. Wildstein's lawyer's other assertions."
ABC News and The Associated Press contributed to this report.