Treasury Secretary Steven Mnuchin Steven Terner MnuchinThe Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Vulnerable Democrats tell Pelosi COVID-19 compromise 'essential' MORE said on Sunday that allegations that President Trump elicited dirt on former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE, a 2020 White House hopeful, during a phone call with Ukraine's leader are merely speculation.

"I think things are being implied that just don't exist," Mnuchin said on CNN's "State of the Union." ADVERTISEMENT

Mnuchin also told CNN's Jake Tapper Jacob (Jake) Paul TapperThe media's misleading use of COVID-19 data Julia Louis-Dreyfus: 'We can't spend much time grieving' Ginsburg Pence aide dismisses concerns rushed vote on Trump nominee will hurt vulnerable senators MORE that he wasn't personally on the call but that other people were.

"I wasn't on the call, but I have no reason to believe the president pressured ... a foreign leader. I think this is a lot being made up about one person's speculation," he said.

A whistleblower complaint filed last week reportedly includes information that Trump asked Ukrainian officials to investigate his political rival, but Trump denies that happened.

Although Trump and his administration officials deny any wrongdoing or pressuring of Ukraine, they refuse to release a copy of the complaint or a transcript of the call.

Tapper on Sunday pressed Mnuchin on why the White House is withholding information.

"Conversations with foreign leaders are supposed to be confidential," he said, adding that it would be a "terrible" precedent to release the details.

No evidence has emerged to suggest Biden acted with his son's interests in mind with regard to his dealings with Ukraine.