Winston Peters banned from Parliament - what's his next move?

The trespass orders handed down by Speaker of the House Trevor Mallard may yet invite a costly legal stoush. 

One of those banned from parliament for two years is mercurial poltician,  NZ First leader and former Deputy Prime Minister Winston Peters: banned for two years from a place he has worked for more than four decades.

Constitutional law expert Professor Andrew Geddis from University of Otago weighs up Winston's possible remedies.