Congress MP Adhir Ranjan Chowdhury on Friday tendered a written apology to President Droupadi Murmu for referring to her as "Rashtrapatni", amid a row over the remark in the Parliament. Chowdhury said he "mistakenly used an incorrect word to describe" the President's position, adding, "I assure you it was a slip of the tongue." He had earlier refused to apologise.