The source said Attorney General Jeff Sessions, Deputy Attorney General Rod Rosenstein and Solicitor General Noel Francisco ate at Central Michel Richard, which is almost across the street from the Trump International Hotel and several blocks down Pennsylvania Avenue from the White House.
The source did not provide additional details on the dinner.
The President chastised Sessions over an investigation into alleged surveillance abuses, calling his approach "disgraceful."
Earlier Wednesday evening, CNN shot exclusive video of Sessions, Rosenstein, Francisco and Justice Department spokesperson Sarah Isgur Flores walking down the street from the Justice Department.
At one point, Sessions pumped his fist in the air as he walked past several people.