Administration officials on Sunday came to President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE's defense amid reports that he pressed Ukraine's leader to investigate 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's son Hunter Biden.

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 during an appearance on CNN's "State of the Union" denied that the topic had come up during Trump’s calls with Ukrainian President Volodymyr Zelensky.

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"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," Mnuchin told 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. "I think things are being implied that just don't exist."

Pressed by Tapper on why the White House will not release a transcript of the call in question, Mnuchin said that "conversations with foreign leaders are supposed to be confidential."

Secretary of State Mike Pompeo Michael (Mike) Richard PompeoWatchdog confirms State Dept. canceled award for journalist who criticized Trump Trump's push for win with Sudan amps up pressure on Congress Putin nominated for Nobel Peace Prize MORE was similarly opposed to releasing a transcript, saying it "wouldn’t be appropriate."

"Those are private conversations between world leaders, and it wouldn’t be appropriate to do so except in the most extreme circumstances," Pompeo said on ABC’s “This Week.”

The secretary of State also defended a potential investigation of Joe Biden’s family, saying, "I do think if Vice President Biden behaved inappropriately, if he was protecting his son and intervened with the Ukrainian leadership in a way that was corrupt, I do think we need to get to the bottom of that."

President Trump, however, implied in remarks to reporters Sunday morning that his call with Zelensky had in fact included discussions of Biden and his son. As he left for an event in Texas, Trump said the subject of the call "was largely the fact that we don't want our people like Vice President Biden and his son [contributing] to the corruption already in the Ukraine."

"I'm not looking to hurt Biden ... but he said a very bad thing. He said a very foolish thing," Trump added.

Meanwhile, Trump’s personal attorney Rudy Giuliani Rudy GiulianiThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting CIA found Putin 'probably directing' campaign against Biden: report Democrats fear Russia interference could spoil bid to retake Senate MORE, who made headlines last week when he said that he had communicated with Ukraine on Trump’s behalf after initially denying it, sparred with “Fox News Sunday” guest host John Roberts on whether the focus should be on the contacts themselves.

"I have all the contacts between Democrats and the Ukraine," Giuliani said. "When the rest of this comes out and we look at China and the $1.5 billion that the Biden family took out of China while that guy was negotiating for us, this will be a lot bigger than Spiro Agnew."

When Roberts asked whether it was appropriate for him to solicit information on Joe Biden from foreign governments, Giuliani responded, “That’s the way you characterize it.”

“That’s the way it appears to line up,” Roberts said, with Giuliani countering, “That’s the way the pro-Biden media lines it up.”

On the Democratic side, House Intelligence Committee Chairman Adam Schiff Adam Bennett SchiffSchiff to subpoena top DHS official, alleges whistleblower deposition is being stonewalled Schiff claims DHS is blocking whistleblower's access to records before testimony GOP lawmakers distance themselves from Trump comments on transfer of power MORE (D-Calif.), one of the most reticent House leaders on impeachment, said it could be “the only remedy” if Trump pressured Zelensky to investigate Joe Biden.

"[I] want the country to understand this is the last resort," Schiff said on CNN’s "State of the Union" on Sunday. "The president is pushing us down this road."

Schiff said House Democrats will push for the release of both the transcript and the whistleblower complaint that brought the allegations to light.

"Clearly, the president is afraid for the public to see either one of those things," he said.

And Sen. Chris Murphy Christopher (Chris) Scott MurphyDemocratic senator calls for 'more flexible' medical supply chain to counter pandemics The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon GOP chairman to release interim report on Biden probe 'in about a week' MORE (D-Conn.) said Zelensky told him he had no intention of interfering in the 2020 presidential election in the wake of the allegations.

"Later in the meeting, I raised with him these overtures from the Trump campaign. He gave me a very strong answer. He said they have no intention of getting involved in an American election, that they knew what damage it would do to them," Murphy said on NBC’s "Meet the Press," referring to a recent trip to Kiev.