agents will take a bullet for the president of the united states , but apparently they wo n't swim for him .
when the public commissions with jurisdiction over the white house heard proposals for beefing up the presidential mansion 's perimiter , they were told that the government would n't be digging a moat around the building .
that idea , it turns out .
but nbc-tv4 in washington reported that ` there was concern expressed about having to retrieve people from it .