House Democrats subpoena US Energy Secretary in Trump impeachment probe

House Democrats have subpoenaed the US Energy Secretary as part of their impeachment investigation into President Donald Trump’s dealings with Ukraine.

The House Intelligence, Foreign Affairs and Oversight and Reform committees sent Rick Perry a subpoena on Thursday asking him to provide documents related to a Ukrainian state-owned energy company as well as his involvement in a July call between Mr Trump and Ukrainian president Volodymyr Zelenskiy.