U.S. regulators shoud not approve.
PSA is part owned by the government of France.
That will make Fiat-Chrysler in part a French government owned entity.
A government owned car maker, in part or in whole, should not be in the U.S. domestic car market.
The U.S. response should be that in order to have U.S. approval the French government must sell its share of PSA.
Airbus.........................