That’s a wrap – thank you for reading the Need to Know blog today. We will be back soon with more live coverage of news, so please join us then. These were some of the main stories:

• Trump says he will sue WSJ over Epstein letter story: US President Donald Trump has threatened to sue Rupert Murdoch, News Corp and the Wall Street Journal over reports published by the paper on Thursday (Friday AEST) claiming that Trump wrote a letter to Jeffrey Epstein for his birthday in 2003. Trump has denied the claim.
• ‘It’s a state issue’: Watt won’t step in over marine crisis: Frustrated marine scientists have asked the South Australian Labor government to lobby its federal counterpart for funds so they can gauge the extent of the algal bloom ravaging the state’s coastal waters.
• Coalition ‘cautious about blanket ban on surcharging’: Opposition Leader Sussan Ley has said the Coalition supports lower transaction fees and better transparency in response to the Reserve Bank’s proposed ban on card surcharges, but has warned the cost of fees could be unfairly borne by small business owners.
• Comyn, Farquhar among latest invitations to productivity roundtable: Treasurer Jim Chalmers has just released the latest list of attendees for the August productivity roundtable:
• Blunt conversations about Trump’s tariffs among G20 participants: Treasurer Jim Chalmers says US President Donald Trump’s tariffs have created some “blunt conversations” among participants at the G20 meeting, including Japan, South Africa, Canada and Indonesia.