Inaugurating a two-day conference on "Capacity Building of State Disaster Response Force 2017", Mr Singh said it was a cause of concern for India and the world community if a country thinks only about its own interests.
"The US president's statement on Paris agreement has come as a shock for us and the international community. I am sure the US will rethink its decision," he said.
It has to be seen in what circumstances the US president made the statement on the Paris accord, Mr Singh added.
External Affairs Minister Sushma Swaraj rejected Mr Trump's comment yesterday and said India signed the Paris climate pact not because of pressure from any country or due to the lure of money.
"Our signature in the pact was not because of greed, it was not because of fear. We signed it due to our commitment to protecting the environment... India will continue to be part of it irrespective of whether the US remains in it or not," Ms Swaraj told reporters at a conference to mark three years of the Narendra Modi government.