President Obama is introduced by former President Bill Clinton at a campaign event Nov. 3, 2012, in Bristow, Va.(Pablo Martinez Monsivais/AP)

President Obama and former President Bill Clinton will meet with Senate Democrats next week during their annual policy retreat at Nationals Stadium, in D.C., according to senior Senate aides.

The two presidents will address the senators separately, the aides said.

Although appearances by the current and former president are common at such meetings, the appearances come amid growing concerns about whether Democrats will be able to hold onto their narrow majority in the Senate. Already Obama has held several fundraisers across the country for House and Senate Democratic campaign accounts, while Clinton is expected to serve as a high-profile surrogate in several close Senate races, especially in states such as Arkansas and Kentucky where Obama is unpopular.

No word yet on whether Obama or Clinton also plan to meet with House Democrats next month at their retreat in Cambridge, Md. They both have addressed the group in previous years.