The latest news from Australia:
Electoral reform abolishing Group Voting Tickets and establishing partially optional preferential voting ‘above’ and ‘below’ the line was passed in both houses last week, and barring an unlikely High Court decision to the contrary, it will go into effect at the next election. Now that the electoral system is no longer an obstacle (and perhaps due to the electoral reform, which aroused the ire of most Senate crossbenchers), Prime Minister Turnbull has all but called the expected double dissolution election, threatening to do so if controversial industrial relations bills do not pass the Senate at the next session, scheduled to start on April 19th.
A double dissolution is the deadlock-breaking mechanism provided by Australia’s Constitution. Though half the Senate is usually elected alongside elections to the House of Representatives, the Senate has a fixed six-year term. This can only be shortened by a double dissolution election where all seats of both houses are up for election. A double dissolution can only be brought about by the government when triggered by a disagreement between the houses, as spelled out by section 57 of the Constitution; if the disagreement with regards to a bill continues after the double dissolution election, those bills can be put to a joint sitting of the houses, where the government is likely to prevail due to the houses’ relative numbers.
Although section 57 gives the government the power to threaten to dissolve the Senate if it does not pass its legislation, there are various factors that complicate this procedure, making it rather cumbersome for the government. There is, of course, also the risk of losing the election. The procedure has only ever been used six times, and the last double dissolution election took place in 1987.