By Evan Perez and Stephen Collinson CNN

WASHINGTON (CNN) -- The US director of national intelligence has denied that the intelligence community leaked claims that Russia holds compromising personal and financial information on President-elect Donald Trump.

In an unusual statement on Wednesday evening that highlighted tensions between spy chiefs and the incoming president, James Clapper, a key adviser to the US President on security and intelligence, rejected a suggestion by Trump that the agencies were responsible for the story going public.

Clapper said he told Trump that intelligence agencies made no judgment about the reliability of the allegations.

The claims were summarized in a two-page synopsis prepared for Trump and Barack Obama ahead of a national security briefing last week. Clapper's statement amounted to the first public confirmation from a US official of CNN's story that the synopsis existed and had been put together for the President, President-elect and eight Congressional leaders.

In his first news conference as President-elect on Wednesday, Trump railed on the US intelligence agencies, suggesting they were responsible for leaking the "nonsense" to the media. Any such move by the agencies would be a "tremendous blot on their record," he said.

Before speaking with reporters, Trump went further in his attack. He said in a tweet: "Intelligence agencies should never have allowed this fake news to 'leak' into the public. One last shot at me. Are we living in Nazi Germany?"

On Thursday, Trump confirmed on Twitter he had received a call from Clapper: "James Clapper called me yesterday to denounce the false and fictitious report that was illegally circulated. Made up, phony facts.Too bad!"

Rep. Adam Schiff, the ranking Democrat on the House Intelligence Committee, expressed skepticism at Trump's claim that Clapper denounced the report.

"Sadly, you simply cannot rely on the President-elect's tweets or statements about what he's receiving in intelligence briefings, and that's a real problem," Schiff told CNN's Chris Cuomo on "New Day."

'Fullest possible picture'

The two-page synopsis -- appended to a report on Russian interference in the 2016 US election campaign -- was based on 35 pages of memos prepared by a former British intelligence operative working initially for Republican opponents of Trump, gathering opposition research about him during the presidential campaign, multiple US officials with direct knowledge of the briefings told CNN.

Clapper said in his statement that the synopsis was included in the briefing because "part of our obligation is to ensure that policymakers are provided with the fullest possible picture of any matters that might affect national security."

"The [intelligence community] has not made any judgment that the information in this document is reliable, and we did not rely upon it in any way for our conclusions," Clapper noted.

It has not been established whether the agencies raised the material from the two-page synopsis directly with Trump at their recent meeting.

But the issue came up in Kansas Rep. Mike Pompeo's confirmation hearing to head the CIA Thursday. Asked by Maine Independent Sen. Angus King if Pompeo would explore questions that arose in those reports, Pompeo stressed that the allegations were unsubstantiated and that he considered the "leaks that occurred" to be "intensely serious."

Pompeo acknowledged Clapper's statement and pledged that he "will pursue the facts wherever they will take us ... with respect to this issue and to each and every issue as well."

Trump clashes with media

At his press conference on Wednesday, Trump attacked CNN and Buzzfeed for their coverage of the story. CNN revealed only that intelligence officials had summarized the claims about Trump and prepared a briefing document, as it could not verify the claims contained in the full 35-page set of memos prepared by the former British intelligence operative. Buzzfeed published the full, unverified memos.

The clash between Trump, the intelligence agencies and the media makes it clear that the President-elect will take office amid persistent questions about his relationship with Russia.

While Trump was at the podium at Trump Tower on Wednesday, his nominee to become secretary of state, Rex Tillerson, faced tough questions on Capitol Hill about whether the incoming administration will view Russia with sufficient skepticism.

At his news conference, Trump finally conceded he believes Russia was behind hacks on Democratic National Committee computers ahead of the election but argued that wouldn't happen again.

"I think it was Russia," Trump said. Russian President Vladimir Putin "should not be doing it. He won't be doing it. Russia will have much greater respect for our country when I am leading it than when other people have led it."

Trump, who has vowed to improve relations with Russia despite some Republican opposition, said he did not know if he would get along with Putin and noted it's possible he won't. But he could not resist a swipe at his defeated Democratic election rival, Hillary Clinton.

"Do you honestly believe Hillary would be tougher on Putin than me?" he asked.

CNN's Ashley Killough and David Wright contributed to this report.

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