ABC News reports:
The growing impeachment probe of President Donald Trump will mark a rare day Wednesday when House investigators are expected to hold two closed-door depositions. Catherine Croft is a Ukraine specialist who worked under Ambassador Kurt Volker, the former U.S. special envoy to Ukraine who has become a key player in the impeachment inquiry.
According to a prepared statement, the career diplomat is expected to testify about her time working for Volker and speaking to her participation in a mid-July 2019 meeting during which “an OMB representative reported that the White House Chief of Staff, Mick Mulvaney, had placed an informal hold on security assistance to Ukraine.”
Croft goes on in her prepared remarks to state it was her understanding this was done at the direction of the president. Christopher Anderson, formerly a special adviser to Volker, will also appear before the three congressional committees leading the impeachment probe.