New Delhi [India], July 31 (ANI): Days after his controversy for referring to President Droupadi Murmu as 'Rashtrapatni', Congress MP Adhir Ranjan Chowdhury on Sunday has written to Lok Sabha Speaker Om Birla, calling on Union Minister Smriti Irani to issue an "unconditional apology" for yelling the name 'Droupadi Murmu' without using the prefix 'President.'