The public hearing of Army Lieutenant Colonel Alexander Vindman, the National Security Council's (NSC) top Ukraine expert, and Jennifer Williams, a special adviser to Vice President Mike Pence, as part of the House impeachment investigation into President Donald Trump has ended.

The House intelligence committee will soon hear from Kurt Volker, the former US special envoy for Ukraine, and Tim Morrison, a former National Security Council Russia a expert.

Al Jazeera's Heidi Zhou-Castro and Kimberly Halkett report from Washington, DC.

Geoffrey Kabaservice, the Director of Political Studies at Niskannen Center and Author of "Rule and Ruin: The Downfall of Moderation and Destruction of the Republican Party", talks to Al Jazeera about the developments.

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