Young will likely face an all-day grilling by the Edwards defense team, which aims to damage his credibility with jurors. The former aide was the first witness called by the prosecution at Edwards' trial, which is underway inside a federal courthouse in North Carolina.
The former Democratic presidential contender has pleaded not guilty to six counts related to nearly $1 million in secret payments from two wealthy donors used to help hide his pregnant mistress as he campaigned for the White House in 2008.
Most of that money flowed through Young, who the defense alleges spent much of the cash to build a $1.5 million house.
