Congresional or Congressional: How To spell?
The word Congresional is misspelled against Congressional, an adjective meaning "pertaining to a congress, especially, to the Congress the United States; as, congressional debates."
Congressional has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings congre & ional which should not be misspelled with single 'S'
Wrong Spelling:  congre-s-ional  Correct Spelling:  congre-ss-ional 
Find more incorrect spellings of Congressional to spell right way.