Michael Cohen’s lawyer Lanny Davis slammed Rudy Giuliani in a fiery interview Thursday, calling him “unhinged” and saying he should be “indicted for witness tampering.”

His impassioned comments came days after President Trump’s personal attorney made comments suggesting Cohen’s father-in-law was involved in organized crime.

“Giuliani, who is half unhinged or 100% unhinged to begin with, goes on national television and suggests a connection to organized crime because he’s a Ukrainian,” Davis said in an interview with George Stephanopoulos on “Good Morning America.”

He also said that “calling out a man's father-in-law and wife in order to intimidate the witness is not fair game and it needs to be investigated.”

Davis didn’t spare Trump either.

The lawyer said the president “indisputably intimidates and obstructs justice to prevent a witness from testifying.”

The commander in chief wrote on Twitter last week to “watch” Cohen’s father-in-law. He has also suggested that Cohen’s father-in-law and wife have ties to organized crime.

Cohen on Wednesday postponed his much-awaited testimony before Congress due to threats made against his family, Davis said. The testimony was scheduled to take place early next month.

"Does the American people, even Trump voters, have any sympathy for attacking a man’s family?" Davis said. "Does any American Trump or non-Trump supporter support that kind of demagogic, reckless interference with Congress as well as obstruction of justice?"

Related: Donald' Trump's longtime lawyer Michael Cohen:

18 PHOTOS Donald Trump's longtime lawyer Michael Cohen See Gallery Donald Trump's longtime lawyer Michael Cohen U.S. President Donald Trump's personal lawyer Michael Cohen exits a hotel in New York City, U.S., April 11, 2018. REUTERS/Brendan McDermid Michael Cohen, personal attorney for U.S. President Donald Trump, arrives to appear before Senate Intelligence Committee staff as the panel investigates alleged Russian interference in the 2016 U.S. presidential election, on Capitol Hill in Washington, U.S. September 19, 2017. REUTERS/Jonathan Ernst U.S. President Donald Trump's personal lawyer Michael Cohen drives after leaving his hotel in New York City, U.S., April 11, 2018. REUTERS/Brendan McDermid Attorney Michael Cohen arrives at Trump Tower for meetings with President-elect Donald Trump on December 16, 2016 in New York. (BRYAN R. SMITH/AFP/Getty Images) Michael Cohen, personal attorney for U.S. President Donald Trump, talks to reporters as he departs after meeting with Senate Intelligence Committee staff as the panel investigates alleged Russian interference in the 2016 U.S. presidential election, on Capitol Hill in Washington, U.S. September 19, 2017. REUTERS/Jonathan Ernst Retired Lt. Gen. Michael Flynn, President-elect Donald Trump's choice for National Security Advisor, Michael Cohen, executive vice president of the Trump Organization and special counsel to Donald Trump, and former Texas Governor Rick Perry talk with each other in the lobby at Trump Tower, December 12, 2016 in New York City. President-elect Donald Trump and his transition team are in the process of filling cabinet and other high level positions for the new administration. (Photo by Drew Angerer/Getty Images) UNITED STATES - SEPTEMBER 19: Michael Cohen, center, a personal attorney for President Trump, leaves Hart Building after his meeting with the Senate Intelligence Committee to discuss Russian interference in the 2016 election was postponed on September 19, 2017. (Photo By Tom Williams/CQ Roll Call) Attorney Michael Cohen arrives to Trump Tower for meetings with President-elect Donald Trump on December 16, 2016 in New York. (BRYAN R. SMITH/AFP/Getty Images) Michael Cohen, President Donald Trump's personal attorney arrives with his attorney, Stephen M. Ryan to speak with reporters after meeting with Senate Intelligence Committee staff on Capitol Hill in Washington, U.S., September 19, 2017. REUTERS/Aaron P. Bernstein Retired Lieutenant General Michael Flynn, White House national security adviser-designate, from left, Michael Cohen, executive vice president of the Trump Organization and special counsel to Donald Trump, and Rick Perry, former governor of Texas, speak in the lobby of Trump Tower in New York, U.S., on Monday, Dec. 12, 2016. Senate Majority Leader Mitch McConnell said he had the 'highest confidence' in the intelligence community, in sharp contrast to President-elect Donald Trump's attack on the CIA after reports it found that the Russian government tried to help him win the presidency. (Albin Lohr-Jones/Pool via Bloomberg) Michael Cohen, President Donald Trump's personal attorney, looks on as his attorney (not pictured) delivers a statement to reporters after meeting with Senate Intelligence Committee staff on Capitol Hill in Washington, U.S., September 19, 2017. REUTERS/Aaron P. Bernstein Attorney Michael Cohen arrives to Trump Tower for meetings with President-elect Donald Trump on December 16, 2016 in New York. (BRYAN R. SMITH/AFP/Getty Images) UNITED STATES - SEPTEMBER 19: Michael Cohen, center, a personal attorney for President Trump, leaves Hart Building after his meeting with the Senate Intelligence Committee to discuss Russian interference in the 2016 election was postponed on September 19, 2017. (Photo By Tom Williams/CQ Roll Call) U.S. President Donald Trump's personal lawyer Michael Cohen exits a hotel in New York City, U.S., April 11, 2018. REUTERS/Brendan McDermid U.S. President Donald Trump's personal lawyer Michael Cohen is pictured leaving a restaurant in the Manhattan borough of New York City, New York, U.S., April 10, 2018. REUTERS/Amir Levy Michael Cohen, President Donald Trump's personal attorney, arrives with his attorney, Stephen M. Ryan, on Capitol Hill in Washington, U.S., October 25, 2017. REUTERS/Aaron P. Bernstein U.S. President Donald Trump's personal lawyer Michael Cohen is pictured arriving at his hotel in the Manhattan borough of New York City, New York, U.S., April 10, 2018. REUTERS/Amir Levy Michael Cohen, personal attorney for U.S. President Donald Trump, departs after meeting with Senate Intelligence Committee staff as the panel investigates alleged Russian interference in the 2016 U.S. presidential election, on Capitol Hill in Washington, U.S., September 19, 2017. REUTERS/Jonathan Ernst Up Next See Gallery Discover More Like This HIDE CAPTION SHOW CAPTION of SEE ALL BACK TO SLIDE

Davis said no matter what, though, Cohen will speak about the “personal abusive behavior” he witnessed while working for Trump.

“They will not thwart this truth coming out,” Cohen’s lawyer said.

Trump took to Twitter following Davis’ interview to call out both the lawyer and his client.

“So interesting that bad lawyer Michael Cohen, who sadly will not be testifying before Congress, is using the lawyer of Crooked Hillary Clinton to represent him - Gee, how did that happen?” he wrote. “Remember July 4th weekend when Crooked went before FBI & wasn’t sworn in, no tape, nothing?”

Davis worked with former President Bill Clinton in the ‘90s.

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