Fitch warns it may have to downgrade slew of US banks including giants like JPMorgan

• Fitch Ratings in June cut its "operating environment" score for the US banking sector.
• Fitch analyst Chris Wolfe told CNBC that another downgrade would mean banking giants like JPMorgan face reevaluations.
• Earlier in August, Moody's slashed the credit ratings on 10 US banks. 

A Fitch analyst warned Tuesday that US banking giants, including JPMorgan, could be at risk for a ratings reassessment if the overall industry's score gets hit with another downgrade.