When he does, US taxpayers pick up the tab, via the local US embassy, direct costs and staff time - - for security coordination, staff time, hotel "control rooms", etc, etc. Probably a couple hundred thousand dollars in taxpayer money for each visit.
(and Bubba then gets, his half million or so from his foreign hosts hoping to curry favor with the spouse of a possible next President)
Don’t forget Billy’s presidential pension and perks. I guess that’s just chicken feed to the phony couple.