Democrats in the U.S. House of Representatives issued subpoenas to the head of the Pentagon, Mark Esper and acting White House Budget Office Director Russell Vaught as part of an investigation into the impeachment of US President Donald Trump.
Parliamentarians demand until October 15 to provide documents related to the decision of US President Donald trump to delay military assistance to Ukraine.
Democrats say documents are needed to examine the sequence of events and the reasons behind the White House decision.