Morning mail: Nationals leadership rumblings, NSW mask rules, snorkelling in the Daintree

Monday: Barnaby Joyce may take Nationals leadership. Plus: national cabinet to hold emergency meeting

Good morning. Weeks of leadership rumblings within the Nationals are expected to come to a head today, with some party members saying Barnaby Joyce could retake the top job from Michael McCormack. The other most likely leadership contender, David Littleproud, has told colleagues that as deputy leader he cannot challenge McCormack. But Littleproud could be clear to run if McCormack spilled his own leadership or chose not to stand again after a successful no-confidence motion in the Nationals party room. Two Nationals MPs have told Guardian Australia that Joyce has or is very close to having the numbers to topple McCormack. I think he's really close," one said. I think he's always been close but I have heard increased noise over the last two weeks."

Australia's troubled vaccine rollout will be discussed in an emergency national cabinet meeting by federal, state and territory leaders today. The vice president of the Australian Medical Association, Dr Chris Moy, urged anyone who has had their first dose of AstraZeneca not to waste it by cancelling their second shot in response to Thursday's updated federal health advice, which recommended the vaccine not be administered to under 60s. The bottom line is the risk of getting a clot from the second dose is one-tenth of an already tiny risk on the first one. And you need [the second shot] for long-term protection and to protect yourself from the variants. You're kind of almost wasting the first dose if you don't have the second. It's a no-brainer - for God's sake have it."