Ketanji Brown Jackson was a former clerk for Justice Stephen Breyer.Anna Moneymaker, David Becker, Douglas Rissing/Getty Images; Isabel Fernandez-PujolJustice Ketanji Brown Jackson seemed alarmed about Trump's ask for sweeping immunity for presidents.Jackson wanted to know how future presidents would be disincentivized to commit crimes. She expressed fear it could turn the Oval Office into "the seat of criminal activity in this country."Justice Ketanji Brown Jackson was animated on Thursday when she discussed the potential of what could happen to the presidency if the Supreme Court were to grant presidents the sweeping immunity former President Donald Trump is seeking."The most powerful person in the world with the greatest amount of authority could go into office knowing there would be no potential penalty for committing crimes," Jackson said during oral arguments.