Mr Bannon, 67, was a central figure in Mr Trump's 2016 campaign but was charged past year with swindling supporters who donated to build a wall on the US-Mexico border.
After four years under the spotlight, Melania Trump has managed to reveal next to nothing about herself, besides how fiercely she seems to value her privacy and freedom.
It could also have fuelled efforts to hold Trump accountable through civil lawsuits brought by private litigants, such as family members of people who died during the January 6 storming of the US Capitol by Trump followers, said Jessica Levinson, a professor at Loyola Law School in Los Angeles.
Earlier this month, Mr Assange won his fight to avoid extradition to the United States but was denied bail under strict conditions for fear he could abscond and deny prosecutors the chance to appeal. Trump did not issue pardons for himself, members of his family or lawyer Rudy Giuliani.
The now-former president left the nation's capital Wednesday morning before the inauguration ceremony for President Joe Biden. Trump's predecessor, 44th President Barack Obama, left town on a flight officially known as Special Air Mission 44.
Miller said that Trump could play a role politically.
Trump has hinted at a 2024 run for the White House and has a colossal campaign war chest that is expected to make him a major influence in next year's midterm elections - with control of the House and Senate up for grabs.
A pardon in practice grants full legal forgiveness for a federal crime, as a result removing any remaining prison sentence, probation conditions or unpaid fines.
Presidential pardons can accomplish so much.
The former executive chairman and co-founder of the right-wing news outlet Breitbart, Bannon is credited as being the architect behind the rise of "America First" right-wing populism.
He was sacked from his post at the White House in August 2017. Fraud prosecutions are frequently brought by the Manhattan District Attorney's Office, Alonso said.
"He has a fairly young crew down there with him, which is typical for presidents once they leave office", the former official said. Numerous staff members are known to have worked for over 10 years. He has expressed support for Trump's criminal justice reform efforts.
And adding to Melania's mystique is the persistent claims she used a body double to stand in for her at events during the Trump administration, her lengthy and unexplained disappearance after undergoing kidney surgery in May 2018 and her nearly total absence during her husband's second and doomed election campaign.