Singh said while his entry into politics was "accidental", Pranab Mukherjee was a politician by choice and is one of the greatest politicians living in our country.
"He had a reason to feel upset but he respected me and we have a great relationship which will continue till we live", added ex-PM.
Singh was speaking at the launch of former President Mukherjee's new book, 'The Coalition Years: 1996-2012, ' in New Delhi. His autobiography is titled Coalition Years 1996 to 2012 and released today at the Nehru Memorial Museum Library, Delhi.
"The former PM described Mukherjee as the" most distinguished living parliamentarian and Congressman", whom everyone in the party looked up to for discussing and resolving hard issues. Mukherjee, in his speech, described the Congress as a coalition in itself, as it brought all ideas on one platform.
"It was hard to have one coalition within and another outside. I became a politician by accident".
"So before the elections, we have got this book on coalition governments which may come handy", he said. Then came 2004 when Soniaji chose me to be the Prime Minister and Pranabji was the most distinguished colleague that I had. However, Singh said his appointment as the Prime Minister did not lead to any bad blood between the two and he still enjoyed good relations with Mukherjee.
"He is a politician by choice and it comes naturally to him". He said if the UPA government ran smoothly, a large measure of credit would go to Pranab Mukherjee. The function was attended by Congress President Sonia Gandhi, her deputy Rahul Gandhi, CPI (M) General Secretary Sitaram Yechury, Samajwadi Party President Akhilesh Yadav, DMK leader Kanimozhi and CPI General Secretary S Sudhakar Reddy.