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.
31 killed, 40 wounded in Israeli raids on Lebanon
Israeli raids targeting several areas across Lebanon on Tuesday killed 31 people and wounded 40 others, Lebanon's health ministry said, in one of the heaviest days of bombing in weeks.
Remnants of Assad's chemical weapons programme recovered
Syria's transitional leadership has located remnants of former President Bashar al-Assad's clandestine chemical weapons programme, including raw materials and munitions similar to those used to carry out deadly gas attacks during the country's long-running civil war.
Chemical tank rupture in Washington state causes multiple deaths and injuries
A chemical tank imploded and ruptured at a Nippon Dynawave Packaging facility in the US state of Washington on Tuesday, resulting in multiple deaths and critical injuries, authorities said.
Nasa begins implementation of permanent Moon base plan
The US space agency Nasa has begun requesting lunar landers, robotic rovers and drones as part of its plan to establish a permanent base on the Moon, less than two months after the record-breaking Artemis 2 lunar flyby mission.
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