The comments followed tweets from Trump on Wednesday morning in which he approvingly repeated Assange’s claim that the Russian state was not the source of the hacked emails from the Democratic National Committee and the Clinton campaign chairman, John Podesta, published by Wikileaks during the election.

“Julian Assange said ‘a 14 year old could have hacked Podesta’ – why was DNC so careless? Also said Russians did not give him the info!” one Trump tweet said.

Another quoted Assange as describing US media coverage on the issue as “very dishonest”. Trump added: “More dishonest than anyone knows.”

The tweets referred to an interview with Assange conducted by Fox News commentator Sean Hannity, a vocal Trump supporter, in the Ecuadorean embassy in London, where the Australian computer expert and transparency advocate has been living for more than four years, since sexual assault charges were made against him in Sweden.

He is also under US criminal investigation for the publication of large numbers of classified US documents by Wikileaks, an act characterised for many years by Republican and many Democrat leaders as an act of aggression against the US.

In the interview, Assange said: “Our source is not the Russian government and it is not a state party.” US intelligence agencies have suggested that Russia passed the hacked material to Wikileaks through intermediaries.

Asked about the Trump tweets, the president elect’s spokesman, Sean Spicer said the president-elect “was stating what Assange is stating publicly and looking forward to [a forthcoming intelligence] briefing to discuss all of these matters.”

Last month Obama deported 35 Russian diplomats in response to the election hacking, in a move criticised as premature by the Trump team. The president elect praised Vladimir Putin for not taking retaliatory measures, saying: “I always knew he was very smart!”

Trump has said he would make public new facts over election hacking known only to him either on Tuesday or Wednesday this week.

The spat is being played out at a time when one investigation into Russian hacking of the US election is nearing completion and another is just beginning. Both have the potential to undermine the legitimacy of the Trump presidency.

An intelligence community review of the evidence is expected to be delivered to Obama on Thursday and will form the basis for a briefing for Trump from top intelligence officials on Friday. Meanwhile, hearings begin on Russian cyber-attacks on Thursday in the Senate Armed Services Committee, chaired by John McCain, a Republican with hardline views on Russia.

Trump’s support for Assange has not led to break with all his Republican allies. Sarah Palin said on Wednesday that she now regretted her attacks on Assange in 2010 after he published leaked documents from her time as governor of Alaska.

“He is an anti-American operative with blood on his hands. His past posting of classified documents revealed the identity of more than 100 Afghan sources to the Taliban,” she said at the time.

“Why was he not pursued with the same urgency we pursue al-Qaeda and Taliban leaders?”

Palin now says she has changed her mind since Wikileaks published Democratic Party emails.

“The media collusion that hid what many on the Left have been supporting is shocking. This important information that finally opened people’s eyes to democrat candidates and operatives would not have been exposed were it not for Julian Assange,” she wrote on Facebook .

The Republican foreign policy establishment however, has been more resistant to such whiplash changes in views and allegiances. Many senior figures are uneasy about Trump’s open feud with the US intelligence community.

On Tuesday, the president elect mocked the US agencies, going so far as putting the word “intelligence” in quote marks.

“The ‘Intelligence’ briefing on so-called ‘Russian hacking’ was delayed until Friday, perhaps more time needed to build a case. Very strange!” he said on Twitter.

In response, intelligence officials briefed correspondents that the plan had always been for the Russian briefing to take place on Friday, and referred to his remarks as “adversarial”.