Source: Adam Kilgore, Washington Post 
The Nationals are looking to beef up the left side of their bullpen, which was lacking last season, especially early in the year. A key cog in the Giants’ 2012 World Series run and an 11-year veteran, Lopez has been one of the game’s most reliable lefty specialists.
General Manager Mike Rizzo sent Meister a text message a week ago, and the sides have a “mutual level of interest,” Meister said.
The sides have not been in touch since the initial communication, but they plan to reconvene.