Poll: Which closer should the Nationals trade for?

On Sunday, Mike Rizzo, president and general manager of the Washington Nationals, told Bob Nightengale of USA Today it's on him to take care of the club's closer situation, stating "losing games in the ninth inning has been so demoralizing."

The Nationals have used six different pitchers to try and secure saves this season, and while youngster Koda Glover has offered some sign of stability, reports surfaced that mentioned Washington is discussing a number of options internally.

Kelvin Herrera, Alex Colome, A.J. Ramos, and Roberto Osuna, as well as a possible reunion with Mark Melancon, were options mentioned by Jon Heyman of FanRagSports, while Chicago White Sox closer David Robertson has been a target of the Nationals for some time.

With Washington owning one of the best records in baseball, a GM who apparently wants to fix the situation, and a strong market for available closers, who should the Nationals go after in a trade?