US Secretary of State Mike Pompeo has been subpoenaed.
A Democratic-led US House of Representatives committee issued the order on Friday.
They want to him to hand over documents regarding contact the US government had with the Ukrainian government.
Earlier this week House Speaker Nancy Pelosi launched a congressional impeachment inquiry of US President Donald Trump.
Australia toughens kids' social media ban
Australia said on Saturday it would double the maximum penalty it can impose on tech firms found to have failed to uphold a ground-breaking social media ban for children, as evidence mounts that the ban has had little effect on teen use.
Strong earthquake hits Hindu Kush, shaking Afghanistan and Pakistan
A strong earthquake struck Afghanistan's Hindu Kush region on Saturday, the European Mediterranean Seismological Centre said, sending out tremors that could be felt from the capital Kabul across the border into neighbouring Pakistan.
Serbian President Vucic says he will resign within weeks
Serbia's populist president Aleksandar Vucic, under pressure after months of anti-government protests, said on Saturday he will resign within weeks and the country will hold early presidential and parliamentary elections.
Death toll in Venezuela quake tops 1,400 as rescue efforts intensify
The death toll from Venezuela's devastating twin earthquakes rose above 1,400 on Saturday as foreign rescue teams poured into the country and authorities pressed on with the search for survivors in the hardest-hit coastal areas.
Authorities investigate light aircraft crash into Beijing skyscraper
A light aircraft crash into Beijing's tallest building on Friday killed the pilot and injured 13 people who were not on board, the local government said following the unusual accident for the Chinese capital, where airspace is heavily restricted.
The UAE Ministry of Defence has announced the death of soldier Issa Ghuloom Al Baloushi, who passed away during a training mission in the country on Saturday.
The UAE has expressed deep concern over the continued military escalation by the two warring parties in several areas of Sudan, including El Obeid, and the impact on civilians and the worsening humanitarian situation.
Under the directives of President His Highness Sheikh Mohamed bin Zayed Al Nahyan, the UAE is sending humanitarian aid to people affected by the ongoing crisis in Lebanon through the UAE Aid Agency.
