US President Donald Trump has issued a strong warning to anyone trading with Iran, following his re-imposition of Sanctions on the Country.

Trump tweeted anyone doing Business with Iran will not be doing business with the United States .Some re-imposed sanctions took effect overnight and tougher ones relating to oil exports will begin in November.

Iran’s President Hassan Rouhani has said the measures are “Psychological Warfare” which aimed to “sow division among Iranians”.The European Union has also spoken out against the sanctions, vowing to protect firms doing “Legitimate Business”.

The Sanctions follow the us withdrawal from the joint comprehensive plan of action, also known as the Iran Nuclear Deal, earlier this year.