Reacting to the much-awaited speech by Mr Mukherjee at an RSS event in Nagpur, CPI(M) general-secretary Sitaram Yechury questioned him for not mentioning the assassination of father of the nation Mahatma Gandhi during his speech.
"In the 'history capsule' delivered by Pranab Mukherjee at the RSS headquarters, the absence of Mahatma Gandhi and his assassination speaks volumes," Mr Yechury tweeted.
The CPI(M) leader also wrote that Mr Mukherjee should have reminded the RSS of its history.
"He would have done well to remind the RSS of its own history - banned thrice by Congress governments, first time by Sardar Patel, following Mahatma Gandhi's assassination. 'RSS men expressed joy and distributed sweets after Gandhiji's death', Patel wrote to Golwalkar," he said in another tweet.
"Though we feel that he should not have gone to the RSS meet, but what Pranab Da said in his speech was expected from him. It was in true sense of nationalism, respecting the Constitution of India, its pluralistic society and composite culture," CPI leader D Raja told PTI.
Mr Raja said a few RSS idealogues are trying to project the speeches of Sangh chief Mohan Bhagwat and Mr Mukherjee in the same spirit.
"Now they are trying to use Mukerjee's speech for their own propaganda," Mr Raja said.