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White House aide expected to testify in impeachment probe on Friday

WASHINGTON, Oct 29 (Reuters) - Robert Blair, an aide to the acting White House chief of staff, is expected to testify on Friday in a closed session of the House of Representatives impeachment inquiry of President Donald Trump, an official working on the impeachment probe said on Tuesday. (Reporting by Patricia Zengerle and Mark Hosenball; Editing by Mohammad Zargham)