It likely will go through but the new company will be forced to sell hundreds of stores in areas where the combined chain dominates. This is pretty common when

It likely will go through but the new company will be forced to sell hundreds of stores in areas where the combined chain dominates. This is pretty common when grocery chains merge and it's likely they've already planned out various maps to suggest to the FTC. The company of course will like to minimize store sales (though they might take the opportunity to get rid of some low performing, expensive to operate stores) and the FTC will try to maximize competition in the overlapping markets.