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.
Supreme Court rejects Trump bid to restrict birthright citizenship
Handing President Donald Trump a stinging defeat, the US Supreme Court on Tuesday rejected his audacious attempt to restrict birthright citizenship in the United States — a right long woven into the fabric of American society — scuttling one of his top priorities in his crackdown on immigration.
South Africa's anti-migrant protesters march nationwide
Anti-immigrant protesters draped in flags and wielding wooden weapons marched across cities in South Africa on Tuesday to mark a deadline they had set for undocumented migrants to leave, with some marches hit by violence and looting.
Iran and US agree to halt attacks, uncertainty over Doha talks
Iran and the United States agreed to halt recent hostilities in the Gulf and renew talks regarding their dispute over the Strait of Hormuz, a US official said on Sunday, raising hopes of saving an interim peace deal that was under pressure from days of tit-for-tat strikes.
Manhunt launched after Monaco blast targets Ukrainian-born oligarch
Police in Monaco and France were searching for a suspected bomber on Tuesday after three people were wounded by an explosion in the wealthy principality which two sources said was an attack on a Ukrainian-born oligarch.
UK's Starmer unveils £15bn defence increase in long-delayed investment plan
Prime Minister Keir Starmer unveiled on Tuesday his long-delayed Defence Investment Plan, promising an increase of £15 billion in funding to better equip Britain to fight the wars of the future in a blueprint he described as his legacy.
