Opposition parties are labelling a bill that would restrict freedom camping as unnecessary and heavy-handed.
A select committee has recommended the Freedom Camping Bill be passed into law.
Under the legislation, councils will be able to fine illegal campers, and prosecute them for dumping sewage from their vans.
The Government wants the bill passed in time for the Rugby World Cup.
But the Labour and Green parties say they won't support it.
Labour says the bill is a punitive measure that threatens other campers' freedom to enjoy the outdoors.
The Greens say a more positive approach would be to simply provide more places, with rubbish bins and toilets, for people to stay at.