Australia politics live news: Barnaby Joyce returns as Nationals leader; Senate hearing on Covid-19 begins

Barnaby Joyce set to become Australia's new deputy PM after retaking Nationals leadership; Senate Covid committee hears from authorities and TGA. Follow latest updates

• Joyce to return as deputy PM after deposing McCormack
• NSW and ACT coronavirus hotspots; Victoria Covid hotspots

10.52am BST

Prof Brendan Murphy, says CSL will continue to produce their contracted amount" of AstraZeneca. We have 53m supplied, with 3.8m jabs so far.

He says there would be no more" than 12-15 million doses needed in Australia, and while it is a matter for government, Australia could end up donating 35m doses to other countries:

We are continuing to make donations of AstraZeneca to countries that have dire needs and wanted we've made significant donations to Pacific Island nations in Papua New Guinea, and we will continue to do that, as was always our intention.

We've always had many more vaccines then we need in Australia.

10.41am BST

The states and territories have approximately 800,000 Pfizer doses on hand at the moment, which health department secretary, Prof Brendan Murphy, says is an appropriate amount" for a dynamic program, and while states would like more supply, they know they are working in a constrained environment.

He said there should be no need for states to cancel appointments, if they have not booked beyond their projected supply.