About half of Americans support sending U.S. military personnel into Mexico to fight drug cartels, according to a Reuters/Ipsos opinion poll, though there is less backing for sending troops without Mexico's approval. The findings show broad public support for calls by most major candidates in the 2024 Republican presidential nomination contest to send special forces into Mexico, the U.S.'s biggest trading partner, or conducting missile or drone strikes there. With the United States experiencing a dramatic rise in overdose deaths related to the synthetic opioid fentanyl, tamping down the flow of narcotics from Mexico has become a major theme among Republicans.