As Democratic leaders put White House on notice that wide-ranging subpoena coming for info on Trump’s Ukraine actions, president goes on defensive with name-calling, expletives

House leaders warn US administration not to intimidate potential witnesses in impeachment probe, announce plans to subpoena White House over Ukraine scandal

New report claims president told Russian FM he was unconcerned about Moscow's interference in 2016 election as US did the same in other countries

US House gives secretary of state 1 week to turn over Ukraine-related documents, announces interviews with state department officials, including former ambassador to Kyiv

House speaker says panels conducting impeachment probe will make sure there's no retaliation against people who provided information in case against president

After US president implies those who helped his accuser should be executed, Democratic House committee chairman warns him against 'witness intimidation'

White House allegedly tried to cover up details of president's phone call; intelligence chief Joseph Maguire calls whistleblower complaint 'unprecedented' amid impeachment calls

'I didn't do it, I didn't threaten anybody. No push, no pressure, nothing,' US president tells reporters a day after Democrats announce the launch of proceedings against him

Pelosi and rookie Congress members with national security backgrounds get behind formal impeachment proceedings despite risk to some closely fought districts

Iranian president to speak as world leaders push for thaw in nuclear standoff; Ukraine's president also to address group as Trump impeachment scandal swirls