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 says upcoming memoir shares the 'ordinariness of a very extraordinary story' Colbert: Melania Trump’s jacket was ‘one message she did not steal from Michelle Obama’ Melania Trump puzzles with 'I really don't care' jacket 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 HolderThe American experience is incomplete without its neighbor – The argument for Americanism Eric Holder: Trump administration has 'brought shame to the nation’ with family separations US law is not on the side of Mueller's appointment as special counsel 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.