Govt visa plan faces shaky Senate Senate crossbenchers may yet block the government's plan to reintroduce temporary protection visas. The government wants to put asylum seekers on a three-year TPV or a five-year safe haven enterprise visa even if they're found to be genuine refugees. Legislation, passed by the lower house in October, also aims to head off High Court challenges against boat turn-backs, claims by asylum-seeker children born in Australia and human rights breaches under the UN Refugee Convention. In September, Palmer United Party leader Clive Palmer announced his voting bloc of three PUP senators and the Motoring Enthusiasts' Ricky Muir would support the plan, delivering the government four of the six votes it needs. Mr Palmer described it as a game-changer which would no longer lock asylum seekers into "a ghetto situation with no hope for them or their families." However, Jacqui Lambie's decision to quit PUP on Monday and a frantic round of lobbying has put the bill's prospects in doubt. Immigration Minister Scott Morrison said he had not given up hope of his bill passing. "I am still working through with the crossbenchers right now," Mr Morrison said, adding that he hoped to reach an agreement before parliament rises in a fortnight. Labor, the Greens and refugee advocate Julian Burnside have been actively lobbying to block the bill. The support of Senator Lambie is no longer assured after she vowed to block all government legislation until a better pay deal is offered to Defence personnel. Senator Muir is also understood to have doubts about the bill. Family First senator Bob Day was initially supportive, but a spokesman said that while he is "receptive" to the government's bill he was not locked in and Senator Lambie's resignation from PUP was giving him pause for thought. Independent Nick Xenophon and the Liberal Democrat David Leyonhjelm have not come to a final view. Senator Xenophon wants to boost the overall refugee and humanitarian intake. Another independent John Madigan will oppose the bill. Briefing notes being given to the crossbenchers by the bill's opponents raise questions about the removal of the government's obligation to obey international law at sea, the fast-tracking of refugee assessment and the removal of the right of appeal. There are also concerns about the removal of permanent protection options, making babies born in Australia to unauthorised maritime arrivals stateless and liable to be transferred offshore and the removal of references to the refugee convention in Australian law.