And that, he says, raises the possibility that down the road the Internal Revenue Service might come calling for the tax, plus interest, plus penalties.
As the Obama administration hashes out internal differences, top Republicans and some moderate-to-conservative Democrats are calling for the president to listen to McChrystal.
The mirror of his community's internal conflict, Mr Trimble has from the outset wavered between presenting the Good Friday Agreement as a necessary evil and calling it an outright gain.