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.
US military marks 11th successive night of attacks on Iran
US Central Command said it completed its 11th consecutive day of strikes on Iran, targeting Iranian military operations centres, maritime capabilities, aircraft hangars, drone storage facilities, and military logistics infrastructure.
Under soaring pressure, India's education minister promises reforms and debate
India's education minister said that Prime Minister Narendra Modi's administration was committed to addressing the concerns of protesting youth and exam reforms, in the latest sign that the government was beginning to respond to growing protests.
Rubio says US still willing to negotiate over Iran crisis
US Secretary of State Marco Rubio said on Wednesday the United States is still willing to negotiate an end to the Iran crisis but Tehran is not serious about talks, as the widening conflict disrupted two of the world's most critical energy chokepoints.
Trump says US airlines can now fly to Lebanon for first time since 1985
President Donald Trump said on Tuesday, after meeting with Lebanon's President Joseph Aoun, that he was directing the US government to allow all domestic airline carriers to fly directly to that country.
Bahrain, Kuwait, Jordan face renewed Iranian attacks after US hits Iran's south
US forces bombed targets in southern Iran overnight after President Donald Trump said Tehran would pay dearly for the deaths of American soldiers, while Iran targeted US sites in Bahrain, Kuwait and Jordan and a tanker was hit in the Strait of Hormuz.
