From Wikipedia:

Most surveys of the 21st century considered James Buchanan (left), Lincoln’s predecessor, as the worst president for his leadership during the build-up to the Civil War. Several ranked Lincoln’s successor Andrew Johnson last for blocking civil rights for freed slaves and undermining Reconstruction. Donald Trump, first ranked in 2018, has consistently polled among the bottom four and twice in last place, due to breaking longstanding norms such as the peaceful transition of power, a US precedent not broken since Washington first set it in 1797.

I’m actually not sure who the 4th one is and don’t want to spend any more time looking.