Lack of historical perspective.
There's Andrew Jackson -- of bad banking policy, defiance of the Supreme Court, and theauthor of the Trail of Tears forced-march deportation of the Five Civilized Tribes to Oklahama. And, James Buchanan who made the Civil War inevitable, Andrew Johnson, who derailed Reconstruction, and, of course Woodrow Wilson, who brought Jim Crow into the Federal government, which had been integrated since Reconstruction, who got us into WWI after promising to keep us out, whose propaganda agency (created to gin up support for our entry into WWI) Goebbels said was his model, who imprisoned political opponents, supported eugenics, promulgated some very unhelpful ideas in the area of foreign policy that cause trouble to this day (notably the "right of self-determination") and started the growth of the Federal bureaucracy that plagues us to this day, modeled on (I kid you not) the central government of the Confederacy, which Wilson admired.
Trump is trying hard to get into that league, with his nonsense of Zelenksyy starting the Russo-Ukrainian war and his "solutions" to problems, like tariffs as a panacea for all foreign policy woes, effectively abolishing due process rights for foreigners, and essentially destroying American science to go after the entrenched Leftists in universities, but he hasn't made it yet. Of course, he still has most of his second term left, so he might manage to edge out one or two of my list to secure a place in among the four worst. (Though I don't expect it -- Trump's governance is more or less random so, instead of 3 years and 9 months more of almost complete rubbish -- the one exception being shrinking the Federal workforce -- like we've seen in his first three month back in office, we might see some brilliant achievements to parallel the Abraham Accords instead, or policies and initiatives that are neither particularly good or particularly bad.)
