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 ObamaCriticism of Melania Trump shows a lot about the #MeToo movement Obama tells Letterman of showing off his 'dad moves' in front of Prince Smithsonian to unveil Obamas' portraits next month 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 HolderFlake's anti-Trump speech will make a lot of noise, but not much sense Former Fox News correspondent James Rosen left amid harassment allegations: report Issa retiring from Congress 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.