Several modern presidents have publicly blamed their predecessor for at least one issue that occurred during their presidency: Trump, Obama, and Reagan are some examples. I am unsure of how historians view this behavior...but it does not elicit a positive response from contemporaries.
Likewise, is there any recorded documents of Lincoln publicly blaming Buchanan for any of the issues he faced?
Why Lincoln: He is consistently ranked among the greatest presidents of all time by historians. I was just curious if him blaming others added to or subtracted from his greatness from a historical perspective.
Why Buchanan: In the examples of Trump, Obama, and Reagan that I cited, the first two frequently blamed directly, or implied, that the problems they faced were their predecessors doing, the third (Reagan) had only one example I could find, but had an apparent way of styling himself in stark contrast to his predecessor. It is this pattern of contrasting/blaming the immediate predecessor that I applied to Lincoln.