State politicians that quit their party mid-term would forfeit their seats in parliament under legislation that would be introduced by a re-elected Liberal government.
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Premier Jeremy Rockliff said his new "stability clause" proposal would ensure that Tasmanians get the government that they voted for.
Under the proposal, members that leave parties would be required to forfeit their seat, and a recount would be conducted by the Tasmanian Electoral Commission to fill the vacancy.
The measure is clearly aimed at preventing situations such as the damaging defection of Liberal backbenchers last year.
"At the last two elections, Tasmanians have voted for a majority Liberal government, but this has been stolen away by individual MPs resigning from their parties and continuing to sit in the parliament as independents," Mr Rockliff said.
"In many cases, these MPs have proceeded to vote against their original parties, and against policies for which they and their party campaigned for at the previous election.
"During the previous term of parliament, the situation of two former Liberal MPs becoming independents created great uncertainty for the government, for our economy and for Tasmania."
Liberal backbenchers Lara Alexander (Bass) and John Tucker (Lyons) defected from the party in May last year, citing concerns with Mr Rockliff's policy to pursue a Hobart stadium and construct the Marinus Link project.
In the following seven months, the government frequently lost control of events in the House of Assembly as the rebel pair backed Labor motions against the government.
In one episode, they supported a motion to refer former energy minister Guy Barnett to the privileges committee over claims of a lack of transparency on the Marinus Project.
Mr Rockliff said the positions that Mr Tucker and Ms Alexander took as independents "were often in direct contrast with what they supported at the 2021 election when running as Liberal candidates".
"They have benefited from significant party campaign resources in order to be elected. They have been supported by their party volunteers at the election," he said.
"They have been voted for by their respective communities on the basis of representing a particular party, its values and its policy platform.
"Yet, once in parliament, they ignore these facts, turn their backs on their party and its volunteers, and cause chaos."
The situation was "clearly untenable", Mr Rockliff said.
If re-elected, his government would begin working on the new clause within 100 days, and introduce legislation into parliament by the end of the year.
The proposed legislation would amend section 34 of the Constitution Act.
Under the change, an elected member's seat would be vacated and a recount staged if the member ceases to be a member of the party for which they were elected.
"This will result in a member of the party for which they were first elected replacing them, and would restore the proportionality of the parliament, as chosen by the voters," Mr Rockliff said.
Attorney-General Guy Barnett said a similar law already existed in New Zealand.
He said a re-elected Rockliff government would consult carefully to ensure that the proposed stability clause was drafted and implemented in a way that was workable, and consistent with the principles of representative democracy.
He said this may also require amendments to other laws, including the Electoral Act.
Mr Barnett said the government would also seek to draft the law in a way to prevent defectors from "gaming" the stability clause by not officially resigning from their party "despite acting consistently contrary to that party's position".
He said the legislation would also include safeguards to ensure that MPs are not ejected from their party, and therefore the parliament, without "just cause".