I assume Frank referred to:

Kitchen Cabinet - Wikipedia, the free encyclopedia

In colloquial use, "kitchen cabinet" refers to any group of trusted friends and associates, particularly in reference to a President's or presidential candidate's closest unofficial advisers. Clark Clifford was considered a member of the kitchen cabinet for John F. Kennedy and Lyndon B. Johnson before he was appointed Secretary of Defense. Robert Kennedy was uniquely considered to be a kitchen cabinet member as well as a Cabinet member while he was his brother's Attorney General.

And not:

Kitchen cabinet - Wikipedia, the free encyclopedia

Kitchen cabinets are the built-in furniture installed in many kitchens for storage of food, cooking equipment, and often silverware and dishes for table service. Appliances such as refrigerators, dishwashers, and ovens are often integrated into kitchen cabinetry. There are plenty of options for cabinets today.^[1]

Because the latter would not make any sense.

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