I dont often agree with Tron, but here I have to agree. In all honesty, any agent who tried something like that would probably get fired and maybe sued for sexual harrassment by either the president, first lady, or the girls themselves. Doing what you suggested to the president's daughters would be out of line, and quite simply, assault. Granted, it is likely someone, somewhere, perhaps a boyfriend, friend, family member, or such has tickled the twins at some point, but to suggest an agent did so, to jepordize his or her job, credibility, and a lawsuit by the president or the first family seems out of the realm of possibility. I just dont think that realistically such would ever happen.
Mitch