The Honourable Kenneth W. Starr , former Independent Counsel (L) and U.S. Solicitor General and Attorney Alan Dershowitz.

President Donald Trump's impeachment defense team will include Ken Starr, whose investigation led to the impeachment of President Bill Clinton, and Harvard law professor Alan Dershowitz, whose clients have included notorious pedophile Jeffrey Epstein and O.J. Simpson.

Also on the team is ex-Florida Attorney General Pam Bondi, CNBC has learned. In addition, Robert Ray, who succeeded Starr as independent counsel in the Whitewater investigation of Clinton, is expected to be on the team. White House Counsel Pat Cipollone and Trump's personal lawyer Jay Sekulow are heading the defense effort.

The Trump team choices came to light four days before his trial is set to begin in earnest in the Senate.

The Republican president was accused in impeachment articles passed by the House of abusing power and obstructing Congress. The charges relate to Trump asking Ukraine's new president to investigate former Vice President Joe Biden — the frontrunner for the 2020 Democratic presidential nomination — while withholding congressionally approved military aid to Ukraine.

The legal lineup will not include Rudy Giuliani, the former New York mayor and another personal attorney for Trump. Giuliani's push last year to get Ukraine to investigate Biden and his son Hunter Biden were the subject of extensive testimony and evidence in House impeachment proceedings.

"The president asked me to do this, and the legal team asked me to do this," Dershowitz said in an interview with CNBC after his role on the defense team became known.

Dershowitz said he will be making oral arguments in the Senate "to address the constitutional arguments against impeachment and removal."

He also said that although he opposed Clinton's impeachment and voted for Hillary Clinton against Trump in 2016, he "is participating in this impeachment trial to defend the integrity of the Constitution and to prevent the creation of a dangerous constitutional precedent."