THE departing CIA director John Brennan has warned that President-elect Donald Trump's "talking and tweeting” was not in the best interests of the United States.
Mr Brennan said Mr Trump did not fully understand the threat posed to the US by Russia.
The comments highlighted the tension between Mr Trump and the intelligence services after the leaking of unverified raw intelligence alleging close ties between Mr Trump and Russia.
In a series of tweets after those explosive allegations were made public, Mr Trump appeared to blame the intelligence agencies for letting the dossier be released.
He wrote: "Are we living in Nazi Germany?”
Mr Brennan told Fox News that Mr Trump had been briefed about the allegations before they were reported, despite the President-elect's advisers saying he was not aware of them.
"What I do find outrageous is equating intelligence community with Nazi Germany,” Mr Brennan said.
The CIA director, who will likely be replaced by Mr Trump's pick Mike Pompeo, advised the incoming President not to forgive Russia for its recent transgressions and warned him to watch his words and actions.
"Spontaneity is not something that protects national security interests and so therefore when he speaks or when he reacts, just make sure he understands that the implications and impact on the United States could be profound,” Mr Brennan said.
"It's more than just about Mr Trump. It's about the United States of America.”
Meanwhile Mr Trump has raised a record $120 million to cover the costs of his inauguration ceremony on Friday.
The real estate mogul has struggled to attract the kind of A-listers who flocked to support Barack Obama at his two inaugurations.
Despite his team playing down reports that performers are refusing to appear, the only artists currently on the bill are the Mormon Tabernacle Choir, America's Got Talent finalist Jackie Evancho and a Bruce Springsteen tribute act.