One Nation MP Mark Latham has deleted controversial tweets at the centre of a defamation case brought against him by a student cleared of terrorism charges, as the Federal Court gave the former federal Labor leader further time to find a lawyer to act for him in the case.

University of NSW PhD student Mohamed Nizamdeen, 26, is suing Mr Latham in the Federal Court over a tweet accusing Mr Nizamdeen of "plotting to kill senior Federal MPs and blow up Sydney Opera House and police/train stations".

Police withdrew a terror charge against UNSW PhD student Mohamed Nizamdeen.

In a separate tweet, the former federal Labor leader urged people to "try avoiding" the student "and his mates".

Mr Nizamdeen was charged with a terrorism-related offence in August last year but police dropped the charges in October after it emerged he was not responsible for a notebook containing details of the alleged plots.