Why all the security, and who pays for it?

Every time Bush travels anywhere, in the U.S. or abroad, the security requirements cause a problem or cost a fortune. Two days ago Bush cancelled a dinner in Chile because they refused to provide the security he requested, and yesterday when he appeared in Colombia they brought out 15,000 troops, two submarines, and an array of battleships, combat helicopters, and warplanes to protect him...

...from...

...his admirers?

http://www.washingtonpost.com/wp-dyn/articles/A4754-2004Nov22.html?