president donald trump has of warned other countries and businesses against doing business with iran saying that doing so would remove any chance of trading with the united states it comes after he reimposed many of the sanctions that were in effect before the twenty fifteen nuclear deal with iran in a tweet trump labeled the renewed sanctions as quote the most biting ever imposed he went on to say that anyone doing business with iran will not be doing business with the united states and it seems that the warning has been heard at least by some in germany for example car manufacturer dialer says that it is suspending its activities in iran until further notice meanwhile iranian president hassan rouhani has said that trump is trying to destabilize his country the sanctions will affect millions of iranians. these people will be hit hardest by the u.s. sanctions mage's suspended in twenty fifteen after just as of u.s.