President Obama stopped by for an unscheduled dinner on Monday night at the home of Sam Kass, a White House chef and adviser to first lady Michelle ObamaMichelle LeVaughn Robinson ObamaMichelle Obama criticizes lack of diversity in politics: one side is 'all white, all men' Obama interrupts Michelle's appearance with 25th anniversary tribute Michelle Obama: Young people feel what's happening now 'not what they were taught' MORE

A White House pool report said his deputy chief of staff, Anita Decker Breckenridge, also joined him for the dinner. 

No other details were provided. 

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Obama flew back to Washington from Martha's Vineyard, Mass., on Sunday night, breaking up his two-week vacation. But it is unclear if Monday night's dinner is the reason Obama made the trip back to Washington before he returns to Martha's Vineyard to resume his vacation on Tuesday. 

White House officials have been mum on the reason for the return.

Earlier on Monday, Obama met with his national security team and then separately with Attorney General Eric HolderEric H. HolderEric Holder group to sue Georgia over redistricting Eric Holder to Trump: 'Taking a knee is not without precedent' Juan Williams: Momentum builds against gerrymandering MORE, two meetings he could have been conceivably done from Martha's Vineyard.

This isn't the first time Obama has spent a little down time with Kass. The White House chef is a frequent golfing partner. He is also engaged to MSNBC host Alex Wagner.