cuomo giuliani split 07260
CNN
cuomo giuliani split 07260
Now playing
02:06
Cuomo, Giuliani clash over Trump-Cohen tapes
Getty Images
Now playing
01:46
Toobin: Giuliani doesn't care about legacy
CNN
Now playing
01:29
Giuliani: Tower meeting was to get Clinton dirt
giuliani moos
Fox News
giuliani moos
Now playing
01:51
Internet mocks Rudy Giuliani's expressions
rudy giuliani 0814
CNN
rudy giuliani 0814
Now playing
01:24
Giuliani defends Trump's insults of Omarosa
CNN
Now playing
01:16
Giuliani says Trump wants Mueller sit-down
SOTU Giuliani full _00113912.jpg
SOTU Giuliani full _00113912.jpg
Now playing
00:49
Giuliani burns Avenatti in Tapper interview
NEW YORK, NY - MAY 28:  Rudy Giuliani, former New York City mayor and current lawyer for President Donald Trump, attends the game between the New York Yankees and the Houston Astros at Yankee Stadium on May 28, 2018 in the Bronx borough of New York City. MLB players across the league are wearing special uniforms to commemorate Memorial Day.  (Photo by Elsa/Getty Images)
Elsa/Getty Images North America/Getty Images
NEW YORK, NY - MAY 28: Rudy Giuliani, former New York City mayor and current lawyer for President Donald Trump, attends the game between the New York Yankees and the Houston Astros at Yankee Stadium on May 28, 2018 in the Bronx borough of New York City. MLB players across the league are wearing special uniforms to commemorate Memorial Day. (Photo by Elsa/Getty Images)
Now playing
01:02
Giuliani booed by Yankee fans on his birthday
Rudy Giuliani Trump tower letter mistake cpt_00000000.jpg
CNN
Rudy Giuliani Trump tower letter mistake cpt_00000000.jpg
Now playing
01:01
Giuliani on Trump Tower statement: It was a mistake
CNN
Now playing
01:32
Giuliani: No Russia pardons during probe
rudy giuliani intv cuomo prime time
CNN
rudy giuliani intv cuomo prime time
Now playing
01:28
Rudy Giuliani: I have a clear conscience
NBC
Now playing
01:30
Giuliani: Truth isn't truth
WASHINGTON, DC - MAY 30:  Rudy Giuliani, former New York City mayor and current lawyer for U.S. President Donald Trump, speaks to members of the media during a White House Sports and Fitness Day at the South Lawn of the White House May 30, 2018 in Washington, DC. President Trump hosted the event to encourage children to participate in sports and make youth sports more accessible to economically disadvantaged students.  (Photo by Alex Wong/Getty Images)
Alex Wong/Getty Images North America/Getty Images
WASHINGTON, DC - MAY 30: Rudy Giuliani, former New York City mayor and current lawyer for U.S. President Donald Trump, speaks to members of the media during a White House Sports and Fitness Day at the South Lawn of the White House May 30, 2018 in Washington, DC. President Trump hosted the event to encourage children to participate in sports and make youth sports more accessible to economically disadvantaged students. (Photo by Alex Wong/Getty Images)
Now playing
01:27
Giuliani's friend says he's different now
NEW YORK, NY - JANUARY 12: Former New York City Mayor Rudy Giuliani speaks to reporters at Trump Tower, January 12, 2017 in New York City. President-elect Trump continues to hold meetings Trump Tower. (Photo by Drew Angerer/Getty Images)
Drew Angerer/Getty Images/FILE
NEW YORK, NY - JANUARY 12: Former New York City Mayor Rudy Giuliani speaks to reporters at Trump Tower, January 12, 2017 in New York City. President-elect Trump continues to hold meetings Trump Tower. (Photo by Drew Angerer/Getty Images)
Now playing
03:17
Giuliani stirring controversy in Washington
WASHINGTON, DC - MAY 05:  Latest appointee to President Donald Trump's legal team and former Mayor of New York City  Rudy Giuliani speaks at the Conference on Iran on May 5, 2018 in Washington, DC. Over one thousand delegates from representing Iranian communities from forty states attends the Iran Freedom Convention for Human Rights and Democracy.  (Photo by Tasos Katopodis/Getty Images)
Tasos Katopodis/Getty Images
WASHINGTON, DC - MAY 05: Latest appointee to President Donald Trump's legal team and former Mayor of New York City Rudy Giuliani speaks at the Conference on Iran on May 5, 2018 in Washington, DC. Over one thousand delegates from representing Iranian communities from forty states attends the Iran Freedom Convention for Human Rights and Democracy. (Photo by Tasos Katopodis/Getty Images)
Now playing
00:59
Giuliani: Trump probably has power to pardon himself
ABC/This Week
Now playing
01:01
Giuliani: Our recollections keep changing
Washington CNN —  

President Donald Trump’s lawyer, Rudy Giuliani, substantially weakened his case against Michael Cohen by going back and forth as to whether Cohen could tell federal prosecutors the truth, said Jay Goldberg, President Donald Trump’s friend and former lawyer.

Giuliani called Cohen, Trump’s former personal lawyer, “honorable” and truthful on several occasions before an audio recording of a discussion between Cohen and Trump about buying rights to a Playboy model’s story about an alleged affair Trump took part in became publicized.

After CNN aired the audio, Giuliani called Cohen a “pathological liar” and said he doesn’t “see how he has any credibility.”

“I expected something like this from Cohen,” Giuliani told CNN’s Chris Cuomo on Thursday. “He’s been lying all week. He’s been lying for years.”

Goldberg, who served as Trump’s divorce lawyer for the President’s first two marriages, said Giuliani “immeasurably” damaged his case against Cohen by changing his tune.

“I knew as soon as Giuliani spoke that he was damaging Trump’s case immeasurably,” Goldberg told CNN’s “Erin Burnett Out Front.” “It ranks near 100 in terms of damage.”

“No defense lawyer would say that,” Goldberg later added.

Goldberg argued that Giuliani’s early assertion on ABC’s “This Week with George Stephanopoulos” that Cohen would tell federal prosecutors the truth “strips the defense of its main weapon of claiming that he is coloring his testimony to favor the government, so he can get a letter of cooperation.”

The former Trump lawyer also said that he advised the President not to hire Giuliani.

“I didn’t think Giuliani knew how to handle a case from the defense perspective. He was a long-time prosecutor and he didn’t know how to set a case up for the possible impeachment of a witness such as Cohen,” Goldberg said.