Speaking to reporters alongside Australian Prime Minster Scott Morrison, Trump called the story 'ridiculous' and insisted it was driven by a 'partisan' accuser.
But he admitted: 'I don't know the identity of the whistle-blower. I just hear it's a partisan person, meaning it comes from another [political] party.'
News reports have suggested the president pressured Ukrainian President Zelensky in a phone call to aggressively prosecute former Vice President Joe Biden's son, Hunter Biden, on corruption charges and used military aid as leverage.
Trump said Friday that 'it doesn’t matter what i discussed,' and insisted that 'someone ought to look into Joe Biden.'
'Fake news doesn’t look into things like that,' he carped, hinting at media partisanship. 'You wouldn't because he's a Democrat.'