(CNN) Monica Lewinsky said Wednesday she wishes President Bill Clinton's attorney general treated the independent counsel's investigation into the Democrat's administration the same way Attorney General William Barr treated special counsel Robert Mueller's probe into Russian interference in the 2016 election.

Lewinsky took to Twitter to react to Barr's four-page letter that summarized Mueller's investigation into Russian interference in the 2016 election. Her response came in reply to a tweet from University of Southern California law professor Orin Kerr, who compared Barr's summary of the Mueller report to Ken Starr's report into Clinton's conduct.

"Imagine if the Starr Report had been provided only to President Clinton's Attorney General, Janet Reno, who then read it privately and published a 4-page letter based on her private reading stating her conclusion that President Clinton committed no crimes," Kerr wrote on Twitter.

Lewinsky, whose relationship with Clinton was scrutinized by Starr's investigation, responded to this with a tweet: "if. f***ing. only."

The four-page letter from Barr said that Mueller did not establish that Trump's campaign or associates conspired with Russia, but Mueller did not exonerate Trump on the question of obstruction of justice. Barr quoted Mueller saying that a determination was made that the evidence was "not sufficient" to support a prosecution of the President for obstruction of justice.

Read More