Mr Priebus said on Fox News Sunday that the "media from day one has been talking about de-legitimising the election". He said Mr Trump's presidency would fight such coverage "tooth and nail every day".
'Alternative facts'
Top Trump aide Kellyanne Conway also criticised the media in a feisty exchange on NBC.
She was challenged by Chuck Todd on NBC's Meet the Press to say why Mr Spicer's first appearance had been to "utter a probable falsehood".
"If we are going to keep referring to our press secretary in those type of terms, I think we are going to have to rethink our relationship here," she said.
Pressed on Mr Spicer's claims, she said he had been presenting "alternative facts".
"Alternative facts are not facts they are falsehoods," Todd replied.
'Alternative facts'
Top Trump aide Kellyanne Conway also criticised the media in a feisty exchange on NBC.
She was challenged by Chuck Todd on NBC's Meet the Press to say why Mr Spicer's first appearance had been to "utter a probable falsehood".
"If we are going to keep referring to our press secretary in those type of terms, I think we are going to have to rethink our relationship here," she said.
Pressed on Mr Spicer's claims, she said he had been presenting "alternative facts".
"Alternative facts are not facts they are falsehoods," Todd replied.