Can Interpol come in to the US and arrest someone?

INTERPOL is not a law enforcement agency, it is a multi-national treaty organization that collects data on criminals from member countries and will provide any nation with the records regarding crimes and crimminals form other nations. It is more of an international police database that provides information through international cooperation. Once a nation's national police uses the information gathered by INTERPOL, it is up to the nation in which the crimminal is in to make the arrest. Source: www.interpol.int