(CNN) The House Intelligence Committee on Tuesday announced it will hear publicly from eight witnesses over three days next week, in another sign Democrats are pushing to complete their impeachment proceedings against President Donald Trump before the end of the year.

The Intelligence panel announced it would hold five impeachment hearings next week over three days, all for officials who have already appeared for closed-door depositions:

Jennifer Williams, an aide to Vice President Mike Pence, and Lt. Col. Alexander Vindman, a National Security Council aide next Tuesday morning

Kurt Volker, the former US special envoy to Ukraine, and Tim Morrison, a National Security Council aide, next Tuesday afternoon

US Ambassador to the European Union Gordon Sondland on the morning of November 20

Laura Cooper, a deputy assistant secretary of defense and David Hale, the under secretary of State for political affairs, on the afternoon of November 20

Former White House Russia expert Fiona Hill on the morning of November 21

The hearing schedule released Tuesday shows that the House will hear publicly from at least 11 of the 15 witnesses who appeared for closed-door depositions over the past five weeks.

The hearing list includes three witnesses who were requested by Republicans: Volker, Morrison and Hale.

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