Which president deserves the title for the Worst President Ever? I put Cheney/Bush as one entity, because the vast majority of the decisions made during the Bush Admin were actually made by Cheney.
The case for Bush/Cheney: Turned the tragedy of 9/11 against the American people and used it as leverage to launch an invasion against an uninvolved nation, killing at least a million innocent Iraqis, thousands of American soldiers, squandered trillions in American resources and destabilized a large region of the world -- vastly increasing terrorism, exacerbating the migration crisis, and strengthening Iran and Russia in the collateral effects.
The case for Trump: Epic and almost comical mismanagement of the American government, unprecedented and unchecked corruption, transforming the Supreme Court and lower courts via the Federalist Society, exacerbating the partisan divide, fomenting overt White Nationalism, normalizing dictators and autocratic governments, alienating allies, and arguably cementing the decline of American influence and power throughout the world.
Feel free to challenge or add to the 'cases' for the respective presidents. I'm adding an 'Other' category because many conservatives will write in 'Obama!' for what I can only assume is a non-racist reason.