If this is true , it's the first I've heard or read about it, coming across this article from a year ago.
Ex-congressman denies being middleman for US president after WikiLeaks published emails damaging to Hillary Clinton in 2016
www.theguardian.com
Before the final list of pardons was released, Fox News anchor Tucker Carlson
called on Trump to pardon Assange, stating that the WikiLeaks founder was in jail “for telling the truth.”
Trump supporters believe that the president was bullied out of pardoning Assange by Senate Republicans threatening to impeach him.
www.forbes.com