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.
Trump says US to help ships stranded in Strait of Hormuz
US President Donald Trump has stated that he would start an effort on Monday morning to free ships stranded in the Strait of Hormuz as a "humanitarian gesture" to aid neutral countries in the US-Israeli war with Iran.
Three cruise ship passengers die in suspected hantavirus outbreak
Three people have died and three are ill after a Netherlands-based cruise ship was hit by a suspected outbreak of hantavirus, a rodent-borne virus that can cause fatal respiratory illness, authorities and media reports said on Sunday.
United jet hits truck and light pole on approach to Newark airport
A United Airlines aircraft struck a light pole and a trailer on Sunday during its final approach to Newark Liberty International Airport, the New Jersey State Police said.
Iran says it has received US response to its latest talks offer
Iran said on Sunday it had received a US response to its latest offer for peace talks, a day after President Donald Trump said he would probably reject the Iranian proposal because "they have not paid a big enough price".
Israeli military urge southern Lebanon residents to evacuate
The Israeli military issued an urgent warning on Sunday to residents of 11 towns and villages in southern Lebanon, urging them to evacuate their homes and move at least 1,000 metres (3,300 feet) away to open areas.
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