Think Progress notes that in 1993, on the floor of the United States Senate, John McCain lent his support to "restrictions on the use of campaign funds for 'inherently personal purposes."
Here's what he said:
"Madam President, the amendment before the Senate is a very simple one. It restricts the use of campaign funds for inherently personal purposes. The amendment would restrict individuals from using campaign funds for such things as home mortgage payments, clothing purchases ... and vacations or other trips that are noncampaign in nature. [...}
"The use of campaign funds for items which most Americans would consider to be strictly personal reasons, in my view, erodes public and erodes it significantly."