Giuliani can't say 100 percent Trump didn't threaten Ukraine aid

Rudy GiulianiRudy GiulianiPiers Morgan, Rudy Giuliani in furious debate over Trump: 'You sound completely barking mad' Rudy Giuliani calls on Cuomo to remove Bill de Blasio Sunday shows preview: States begin to reopen even as some areas in US see case counts increase MORE on Monday said that he can’t say for certain that Trump didn’t threaten Ukraine aid when he spoke to that country's president about an investigation into former Vice President Joe BidenJoe BidenBiden formally clinches Democratic presidential nomination The Memo: Job numbers boost Trump and challenge Biden Chris Wallace: Jobs numbers show 'the political resilience of Donald Trump' MORE's son. 

Giuliani, who is acting as the president's personal attorney, during an interview Monday with Fox Business first said reports that Trump threatened to cut aid was “a false story,” but then backtracked when pressed. 

“Did the president threaten to cut off aid to the Ukraine?” Fox Business host Maria BartiromoMaria Sara BartiromoRudy Giuliani calls on Cuomo to remove Bill de Blasio Lara Trump: Twitter no longer 'a platform for free speech' Trump lashes out at Fox News after poll shows him trailing Biden MORE asked Giuliani during the interview. 

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“No, no, that was a false story,” he responded. 

“One hundred percent?” the host asked Giuliani. 

“Well, I can’t tell you if it’s 100 percent,” Giuliani said.

The Wall Street Journal on Friday reported that Trump repeatedly pressured Ukraine President Volodymyr Zelensky to investigate Biden's son Hunter Biden, who had been doing work in Ukraine.

Biden is running for the Democratic presidential nomination and is seen as the front-runner. Polls have shown him ahead of Trump in head-to-head match-ups. No evidence has emerged of any impropriety on the part of the former vice president, even as Trump has made calls for him to be investigated.

The Journal reported that its source said the issue of U.S. military aid to Ukraine didn't come up in the call, but lawmakers are now focused on whether there was any connection between aid and the pressure on Zelensky.

Trump has acknowledged discussing Biden and the investigation with Zelensky but has repeatedly said he did nothing wrong while dismissing Democratic criticisms. 

The allegations over Trump’s call with Ukraine has led to renewed calls for an impeachment inquiry by some House Democrats. Speaker Nancy PelosiNancy PelosiNRCC turns up heat on vulnerable Democrats over Omar's call to abolish police Shocking job numbers raise hopes for quicker recovery Engel primary challenger hits million in donations MORE (D-Calif.) warned of a new stage of investigation on the matter but did not use the word impeachment in a letter sent to members on Sunday.

She did say the matter needed to be handled immediately, noting a whistleblower had brought up the matter and the the Justice Department's inspector general had labeled it an urgent matter. 

The contents of the whistleblower complaint have not been revealed to Congress, which is another issue that has rankled Democratic lawmakers. Pelosi has joined Democrats in calling for the complaint to be released to Congress.