Last week was a tough one for Malcolm Trumble, President of Australia. But this week will be even worse, with the PM now facing three critical problems. On the right, Senator Cory Bernardi is about to quit the Liberal Party. On the left, moderate MPs are pushing for a parliamentary vote on same-sex marriage, forcing the PM to block a change that he himself supports. And hanging over his head are the government’s awful polling numbers from this morning’s first Newspoll of the year.