Boris Johnson becomes Britain's new Prime Minister today, promising to re-invigorate the United Kingdom, which he likened to a sleeping giant.

The lawyer representing 18 Australian women and children trapped in a Syrian refugee camp is urging the Senate to knock back new national security laws aimed at preventing their return home for two years.

Home Affairs Minister Peter Dutton said temporary exclusion orders to prevent people from returning to Australia to do harm were a government priority.

Canadian police now suspect two teenagers could be involved in the murder of young Sydney man Lucas Fowler and his American girlfriend Chynna Deese.

The Australian Tax Office says the problem of scammers impersonating officials has become so big, it's referred the matter to the Serious Financial Crimes Taskforce.

Last night's finale of Masterchef was also the final episode for its three judges after Network 10 suddenly ceased contract negotiations with its stars for the next season.

Satellite images showing no reconstruction of the Rohingya villages razed by the Myanmar military in 2017 appear to prove it's still not safe to repatriate Rohingya refugees.

British sprinter Duncan Scott has followed the lead of Australia's Mack Horton at the FINA world swimming championships, refusing to acknowledge the victory of Chinese swimmer Sun Yang.

Countdown to Number 10 - it looks likely Boris Johnson will become the next UK prime minister, and if so he'll immediately face an international crisis in the Middle East; And in Vietnam, a 70-year-old Australian has been held for six months on what his family says are political charges.

A judicial review into the conviction of the woman who's been dubbed Australia's worst female serial killer has found there is no reasonable doubt that she carried out her crimes.