National Party members are pushing for a new "waka-jumping" law to force rogue list MPs out of Parliament.
Delegates at the party's northern regional convention yesterday voted to ask the Government for the law.
Former NZ First MP Brendan Horan is the only MP who would be affected but National Party members were spooked this month by fears that disgraced junior list MP Aaron Gilmore would stay in Parliament against party wishes.
Gilmore sparked fury for telling a waiter at a Hanmer Springs hotel he could get the prime minister to sack him if he refused to serve more wine.
"Don't you know who I am," he allegedly asked the waiter.