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 ObamaMan who killed teenager who performed at Obama inauguration sentenced to 84 years in prison December sales cement best-seller status for Michelle Obama's book: report De Niro: Democrats 'have to be more aggressive' 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 Himpton HolderProtecting voices of all voters is critical to free and fair elections Castro to headline forum in New Hampshire after announcing 2020 decision New Jersey governor calls for redistricting reform 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.