TL;DR... Senator David Leyonhjelm tried to bring forward debate on a Greens marriage equality bill to stymie passage of senate voting reforms he doesn't want. If passed, the motion would have meant marriage *had* to be voted on before the Senate stops sitting on Thursday.

But the Greens support the senate voting reforms, so they voted with the Coalition against the marriage bill being debated. And then the Greens said let's just discuss it on Thursday instead, during private senator's time.

In a letter obtained by BuzzFeed News, Greens senators Richard Di Natale and Robert Simms asked Labor senator Penny Wong to move the debate to a vote on Thursday.