with no deal in march. that's the option backed by hard line prexteers on the conservative benches. and the third option is everyone takes fright and can't agree on anything, so they kick the entire exit process into the long grass. that would involve an extension of article 50 which would also need the agreement of all 27 eu states, far from the given. ministers continue to insist if the agreed on tax with brussels is rejected britain enters uncharted waters. >> we can no longer assume that by rejecting this deal there will be a better shade of brexit. and what is more likely if this deal is rejected is that we have the risk of brexit paralysis. >> reporter: rarely has the government been so thwarted getting its key policy through the house of commons. now parliament has power but no common purpose.