All the way back to Truman, it’s the R presidents who added the most debt
A fascinating chart via Wikipedia. In addition to showing how much debt was added during each presidency, all the way back to Truman, the chart also shows debt relative to GDP. The reason for that is that $1 trillion in debt in 1950 was a heck of a lot more than $1 trillion in debt today. So the ratio gives you a sense of how big the figure really is in the dollars of the time.
What do we see? That during Democratic presidencies, all the way back to Truman, there was a decrease in the ratio of total debt to GDP. But during Republican presidencies, all the way back to Nixon, there was an increase in the ratio of total debt to GDP.