This video from the USA says about itself:
2 December 2010
USA: TRUMP REPORTEDLY PLANS TO PARDON SCOOTER LIBBY The former chief of staff to Vice President Dick Cheney was convicted of perjury and obstruction of justice after a leak that disclosed a CIA agent’s name. [HuffPost]
That CIA agent was Valerie Plame. Cheney and Libby outed her as revenge for her debunking of their lie that Iraq was supposedly buying uranium from Niger to make weapons of mass destruction; a lie which the Bush-Cheney administration intended to use as pretext for starting the Iraq war. This is called the Plamegate scandal.
UPDATE: meanwhile, Trump has pardoned Libby. Joe Wilson Reacts To Scooter Libby Pardon: ‘Trump Is A Vile And Despicable Individual’. The former ambassador and his wife, former CIA agent Valerie Plame, were at the center of the Libby case. She says Trump’s basis for the pardon is “simply false”: here.