Lincoln and FDR were essentially dictators.
They both greatly expanded the power of the presidency, but calling them “dictators” is a bit much, isn’t it?
FDR in the period before NIRA was struck down could do essentially whatever he wanted with the executive branch's regulatory powers, and the compliant Democratic supermajorities in both houses of Congress assured that he could arrogate more such powers effectively at will. The idea that he continued to be a quasi-dictator after NIRA was struck down is hyperbolic and tendentious, though.