ARCHIVED COVERAGE: Trump impeachment hearings enter their 2nd week

WATCH ABOVE: Aide testifies Trump call to Ukraine was "improper"

As impeachment hearings enter their second week, Democrats expect to hear from eight additional witnesses about U.S. President Donald Trump’s dealings with Ukraine.

READ MORE: Trump says he ‘likes the idea’ of offering testimony in impeachment hearings

Here’s what’s to expect on the impeachment schedule:

House Speaker Nancy Pelosi has said Trump is welcome to appear or answer questions in writing, if he chooses.

Witnesses expected to testify include:

  • Lt. Col. Alexander Vindman, a National Security Council official who said he raised concerns in the White House about Trump’s push for investigations
  • Gordon Sondland, Trump’s European Union ambassador, who spoke to the president about the Ukraine policy
  • Former Ukrainian envoy Kurt Volker
  • Jennifer Williams, an aide to Vice-President Mike Pence detailed from the State Department
  • Former National Security Council aide Tim Morrison
  • Fiona Hill, a former Russia adviser to the White House who told lawmakers about former National Security Adviser John Bolton’s concerns about Ukraine.
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With files by The Associated Press