Per the PA BullyPenn News: "A candidate can’t actually file for a vote recount under Pennsylvania law. Instead, they would have to challenge a county board regarding its vote computations, and a state appeals judge would have to rule that a statewide recount is necessary. That means the Clinton campaign would either have to request a recount by petition in every voting district or present a prima facie case showing voter fraud. (Prima facie is a lower threshold than beyond a reasonable doubt. A judge would just have to rule that fraud probably occurred in order to call for a recount.)"
Here is the full article:
PA RECOUNT
I don't think they can prove voter fraud, but they might have a state appeals judge already agreeing to a recount. Wouldn't put it past the Stein/Clinton Cartel. Also if Stein was so interested in voter integrity then why not ask for recount in NH, or VA, or NM?