UPDATE -- The Cubs and Blue Jays are still involved in talks for Papelbon in addition to the Nationals, according to MLB.com's Todd Zolecki. Those are the three teams "most seriously pursuing" the closer at this time, though it is unclear if a deal is imminent.
ORIGINAL -- The Phillies and Nationals have discussed trade scenarios involving closer Jonathan Papelbon, according to a report from the FOXSports.com duo of Jon Morosi and Ken Rosenthal. CSNPhilly.com's Jim Salisbury adds that Papelbon has not yet been approached by the Phillies about a deal, but would only accept a proposal if he was going to become his new team's closer.
Washington has a very capable closer of their own in Drew Storen, who has posted a 1.73 ERA while saving 29 games in 38 appearances so far this season, though they have been rumored to be looking for an additional bullpen arm for weeks. The team reportedly had interest in Reds' closer Aroldis Chapman last month and had discussions with Cincinnati about a deal, but nothing has come to fruition to this point. Craig Kimbrel (Padres) and Francisco Rodriguez (Brewers) are among the other available closers on the market.
Papelbon has been very vocal about his desire to leave Philadelphia, and has been linked most prominently to the Bleu Jays and Cubs in previous trade rumors. Recent reports have noted that the Phillies are having a hard time finding a suitor for the 34-year old due to his vesting option for next season, though Washington has a little bit of financial flexibility and may be open to making an aggressive move.
In 33 appearances for the Phillies this season, Papelbon has posted a 1.63 ERA while saving sixteen games.