"Of course, I am upset but this is part of life," he told reporters here when asked for his reaction on the court order.
"I have always said I am open for legal scrutiny... I am sure the truth will prevail and I will get a chance to put forward my case with all the facts," Singh added.
Earlier in the day, a special court summoned Singh along with industrialist Kumar Mangalam Birla, ex-coal secretary P C Parakh and three others as accused in a case pertaining to allocation of Talabira-II coal block in Odisha in 2005 and asked them to appear before it on April 8.