President Trump has a history of recording phone conversations, according to a report Saturday.

While leading his business empire from Trump Tower in New York City, Trump occasionally used one or more recording devices to tape phone conversations, former high-level employees and a former associate of Trump's told the Wall Street Journal.

The report comes amid mounting questions of whether Trump records private conversations in the White House.

The unnamed associate of Trump's said he was aware that Trump recorded a phone conversation with him because it was used as evidence in a lawsuit.

While the Trump Organization didn't immediately return the Wall Street Journal's request for comment, Michael Cohen, Mr. Trump's longtime personal attorney said he isn't aware of any taped conversations.

"In the decade that I worked for Mr. Trump, I have never seen a recording device attached to his phone, nor am I aware of any occasion where he taped a conversation," he said, according to the report.

A New York Times report on Thursday said Trump asked FBI Director James Comey, who he fired on Tuesday, to declare his loyalty to him. Afterwards, Trump suggested that he might be recording his private encounters. "James Comey better hope that there are no 'tapes' of our conversations before he starts leaking to the press!" Trump tweeted Friday morning.

White House press secretary Sean Spicer did not confirm or deny the existence of secret recordings of conversations between Trump and Comey during the White House press briefing on Friday.

"The president has nothing further to add on that," Spicer said when asked about Trump's tweet. He then refused to comment when asked why Trump sent the tweet or if the White House has recording devices in the residence or the West Wing.

According to a Washington Examiner report on Friday, these Trump tapes, if they exist, would be subject to government record-keeping laws.