SORRY EVERYONE, there were several links from different sources. Here is the 2021 link to the survey that once finished rounded out the numbers.
https://www.c-span.org/presidentsurvey2021/?page=overall
https://www.usnews.com/news/special-reports/the-worst-presidents/articles/how-historians-rate-presidents
The 1948 Schlesinger poll ranked Warren G. Harding, Ulysses S. Grant, Franklin Pierce, James Buchanan and Zachary Taylor as the five worst presidents in American history. In the 1982 Siena poll, the list was the same, save for Andrew Johnson taking Taylor's spot in the bottom five. Future iterations of the poll saw little turnover among the worst of the bunch, with Johnson, Buchanan, Harding and Pierce perennial presences.
"The presidents at the bottom were the ones who failed to safeguard us and adequately lead us during periods of crisis, or tainted the office through scandal and incompetence," Levy says. "Andrew Johnson, James Buchanan, Warren G. Harding – they earned their spots at the bottom."
In a bid to determine which presidents are viewed as the least successful in American history, U.S. News averaged the results of three recent scholarly surveys – the latest rankings from Siena College and C-SPAN, as well as a Presidential Greatness poll conducted by researchers at the University of Houston and Boise State.
After extensive debate by historians and experts throughout his presidency about where he might land upon a list of the oval office's worst,
Donald Trump is the second-worst president in the U.S. News Worst Presidents rankings.