A war of words broke out in Lok Sabha on Monday over Congress leader Adhir Ranjan Chowdhury's remarks that Prime Minister Narendra Modi and Union home minister Amit Shah were 'infiltrators'.

The BJP demanded apology from Chowdhury over his remarks.

The Congress leader had made the the remarks while speaking on the contentious NRC issue on Sunday. The Congress leader also said Modi and Shah are migrants since they have their homes in Gujarat but are now living in Delhi.

Parliamentary affairs minister Pralhad Joshi took a swipe at the Congress over its president Sonia Gandhi's foreign origin, saying its own leader is an 'infiltrator' and it target others in a similar manner.

During the Question Hour, when Chowdhury rose to ask a supplementary related to the steel ministry, BJP members tried to mock him by shouting the word 'infiltrator' several times.

The Congress leader immediately tried to counter by saying: 'Yes, I am an infiltrator, I am a deemak (termite).'

'Modi is an infiltrator. Amit Shah is an infiltrator. L. K. Advani is an infiltrator,' he said.

Union petroleum and steel minister Dharmendra Pradhan shot back, saying Chowdhury's 'design would be exposed soon'.

'Sab khulengi, aap ki paribhasha se desh nahi chalega (Everything will be exposed. The country will not run by your definitions),' Pradhan said.