Ken Starr, the man behind the probe of President Bill Clinton and his relationship with White House intern Monica Lewinsky, has said in a new book that he regrets the turn his probe took. According to CBS News, he regrets that he took on the Lewinsky angle of the investigation. However, he says there was no practical alternative. Ever since then, Lewinski has claimed that she was branded a stalker, home-wrecker, and opportunist [VIDEO].

Starr told "CBS This Morning" that he regretted the whole Lewinsky investigation.

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He said that when he learned the president may have been in the process of committing perjury and obstructing justice, he went to Attorney General Janet Reno. She agreed with him and they moved forward with the investigation.

Lewinski still feeling the effects of the investigation

Since the probe and investigation, Monica Lewinsky has been the victim of online harassment [VIDEO] and has since become an advocate in the fight against cyber-bullying. Starr told CBS' Norah O'Donnell that while he regrets the pain his investigation caused, he will not apologize to Lewinski.

Ken Starr and his team were made aware of President Clinton's affair by White House staffer Linda Tripp. Tripp also happened to be a witness in the investigation of the suspicious death of Deputy White House Counsel Vince Foster. Foster was found dead in July 1993 and police ruled his death a suicide.

Tripp came forward and was asked to file a written affidavit. At the time, Starr was investigating Clinton for Whitewater. Starr said Clinton acted the same way regarding the Lewinski investigation as he did during the Whitewater phase of the investigation, so Starr believed something needed to be done.

Ken Starr considered perjury charges against Hillary Clinton

Starr told Fox News that he considered bringing up perjury charges against the first lady. Starr said Hillary Clinton repeatedly claimed she did not recall certain things when asked by investigators. Starr said that he understands that human memory isn't perfect, but he believes she was delivering a performance, which he thought was preposterous.

Starr decided not to pursue perjury charges because it would have been nearly impossible to prove she lied. Starr told Fox News' Tucker Carlson that he did not have the evidence needed to bring up those charges. Starr's book ("Contempt: A Memoir of the Clinton Investigation") is available now.