In the US it is the secret service. They are part of the Treasury Department.
In other countries then various government or military departments carry out a similar role.
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The first men as president didn't take payment. They were wealthy men in their own right.
The President that first said all men are created equal was Thomas Jefferson. He was the third president of the United States.
That would be all of them except for the 43 men who DID serve as President.
Men do not have "maiden names," which are the names that women are born with as opposed to their married names. The full name of the 41st President is George Herbert Walker Bush. He is sometimes referred to as "George H. Bush" or "Bush 41" because his son, George Walker Bush (George W. Bush) was the 43rd US President.
Up to and including Barack Obama, 43 men have been President of the United States. The reason Obama is referred to as the 44th President is that Grover Cleveland is referred to as the 22nd and 24th President because his two terms were non-consecutive.