He started a war against Americans; attacking their rights, judicial system, their democratic principles. Pardoned war criminals, put children in cages, undermined NATO, cleared out the US military of Generals that voiced any opinion that offended him.
He emboldened Putin, Edrogan and al-sayed in Syria and cosied up to dictators across the globe.
Niger, Yemen & Somalia saw increased US involvement and his assassination of Iran's General Soleimani came close to sparking a disastrous response.
He's a petulant imbecile who left the world less safe after his presidency and if he gets in there is nobody left to put the brakes on. He can't even be prosecuted for acts of treason and can pardon those who do.
This is a man who publicly asked for a billion dollars from oil companies for his campaign and promised to scrap all regulation that they objected to in return.
He'll sell out anyone for his own enrichment.