<p>President Bush stepped into the middle of a confrontation and pulled his lead Secret Service agent away from Chilean security officials who barred his bodyguards from entering an elegant dinner for 21 world leaders Saturday night.</p>
<p>Several Chilean and American agents got into a pushing and shoving match outside the cultural center where the dinner was held. Bush noticed the fracas after posing for pictures on a red carpet with the summit host, Chilean President Ricardo Lagos and his wife and first lady Laura Bush.</p>