GREENSBORO, N.C. (AP) - An ex-aide to presidential candidate John Edwards is expected to retake the witness stand once again to face tough questions about secret donor money funneled to pay personal expenses.

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Andrew Young was the first witness called by prosecutors after opening statements Monday and he has remained on the stand all week.

Young's testimony is essential to making the government's case that Edwards directed a conspiracy to use nearly $1 million in secret payments from two political donors to help hide his pregnant mistress as he sought the White House in 2008.

Edwards denies knowing about the money and has pleaded not guilty.

A defense lawyer forced Young to acknowledge Thursday that much of the money went to help build his family's $1.5 million dream house, not provide for the mistress.