More Republicans want to take the fight to Mexico’s cartels. Experts say it’s a bad idea.

A fringe idea to directly take on the Mexican cartels with the U.S. military is gaining some traction in the Republican party — even as critics warn that any unilateral action would endanger relations with Mexico and fail to alleviate the flow of drugs across the border.

Several leading Republican presidential candidates, including former President Trump, have backed unilateral military action in Mexico. At the same time, conservative lawmakers have introduced legislation to either authorize U.S. military action against the cartels or designate them as terrorist groups, a label that could pave the way for military force. 

“I will impose a full naval embargo on the drug cartels and deploy military assets to inflict maximum damage on cartel operations,” Trump said in a 4-minute video this month filmed on the border. 

Yet direct military action still has scant support among centrist Republicans in Congress, who argue there are more effective ways to address the cartels and stop the illegal trafficking of fentanyl and other illicit drugs that are killing Americans.

Rep. Michael McCaul (R-Texas), the chairman of the House Foreign Affairs Committee, said military action “sounds great” in principle but would likely backfire.

“What you end up doing is you’re essentially declaring war against Mexico and it would have widespread ramifications,” McCaul told The Hill. “There are ways to deal with the cartels, including other operations not quite so public.”

The debate has already strained an already fractious relationship with Mexico, America’s No. 1 trading partner.

Mexican President Andrés Manuel López Obrador blasted the proposals for military action in his country earlier this year, saying his country was a “free, independent, sovereign state” that would not allow foreign government interference.

Stephanie Brewer, the director for Mexico at the Washington Office on Latin America, said some of the talk might be political rhetoric — but admitted she had a “real concern” about the discussions around military force in Mexico.

“The way it's being discussed normalizes what should be a very abnormal proposal,” Brewer said. “There are already consequences in the bilateral relationship just from the proposals that are out there.”

Launching military operations against the cartels, who have operated in Mexico for decades, is not a new idea and related legislation has been introduced in the past.

But it appears to be attracting more GOP support along with rising concerns over fentanyl, which kills 150 Americans everyday. While the ingredients for the synthetic opioid are produced in China, much of production occurs in Mexico. Both countries have largely dismissed U.S. criticism over their roles in the epidemic in America. 

The cartels are also involved with smuggling migrants over the border, a leading concern for Republicans in the 2024 White House race. And many Republicans have sought to link the two issues, though research has shown migrants play a marginal role in the fentanyl trade. 

Trump has floated the idea of military action against cartel operations before and as president privately discussed with aides several options to combat the criminal organizations, including with military strikes, according to Rolling Stone.

In his video from the border this month, Trump pledged to fight the cartels and argued  the country has turned into “hell” due to President Biden’s handling of the border.

He is not alone with that view in the crowded GOP presidential field.

Sen. Tim Scott (R-S.C.) said the cartels will “cease to exist” if he is elected president.

“I will freeze their assets, I will build the wall and I will allow the world’s greatest military to fight these terrorists because that’s exactly what they are,” Scott said in a May speech.

Former South Carolina Gov. Nikki Haley proposed sending in special forces to combat the cartels in what she said would be a similar method to addressing ISIS in the Middle East.

“Either you do it or we do it,” Haley said at a town hall in March, addressing Mexico. “We are not going to let all of this lawlessness continue to happen.”

Florida Gov. Ron DeSantis, the top candidate after Trump, has not explicitly endorsed military action but said last month “we really need to hold the Mexican drug cartels accountable” over migration concerns.

And Vivek Ramaswamy, a longshot for the GOP presidential nomination, said in May the U.S. “should use our military to annihilate the Mexican drug cartels and finally end the supply-driven fentanyl crisis.”

If a Republican takes the White House and the GOP also wins both chambers of Congress, there still appears to be limited GOP support for an Authorization for the Use of Military Force (AUMF), which would be needed to conduct military operations without a formal declaration of war.

Rep. Joe Wilson (R-S.C.), a member of the House Armed Services Committee, told The Hill that “we need to do all we can to block the cartels” from endangering the U.S. but opposed military action. 

Sen. Dan Sullivan (R-Ala.), who sits on the Senate side of the committee, declined to speak on any specific proposal but suggested another path.

“The first way to combat the cartels in Mexico is to secure the border,” he said.

Still, there is congressional support to get tougher on Mexico’s government, which is largely seen in Washington as too corrupt and inadequate to combat the scourge of cartels. Mexico City launched an ongoing war on the criminal organizations in 2006 with little results, even with billions of dollars of support from the U.S.

Reps. Dan Crenshaw (R-Texas) and Mike Waltz (R-Fla.) introduced legislation in January to create an AUMF against the cartels. The lawmakers equated the organizations to terrorist groups like ISIS and argued it was “time we directly target them” and “go on offense.”

Other legislation is more limited, seeking to designate the cartels as foreign terrorist organizations (FTO) and label fentanyl as a chemical weapon — but those moves could open the door for military action.

Sen. Lindsey Graham (R-S.C.) said his bill for an FTO designation will “set the stage” for military action if needed and explained it would “put the cartels in our crosshairs.”

An FTO designation might instead lead to non-military action, such as the prosecution of cartel supporters, but experts say the label would be misguided because criminal organizations operate differently than terrorist groups. A similar designation to label fentanyl a chemical weapon would also be misapplied, experts told The Hill. 

Michael Lettieri, a senior fellow for human rights at the University of California San Diego’s Center for U.S.-Mexican Studies, said drug trafficking “has a market motive” and does not have a “political motive,” in contrast to terrorist groups.

“The thing that actually makes drug trafficking work is corruption networks, which you do not go after with the military,” Lettieri said. “You go after [the cartels] with financial investigations and sanctions.”

Any military operation would be extremely difficult because there are dozens of criminal gangs in Mexico and several competing cartels, including powerful transnational crime syndicates such as the Sinaloa and Juarez cartels. 

Mexico’s more than decade-long war on drugs has also failed to achieve results and experts say the U.S. military would face similar obstacles.

Christopher Adams, a senior policy analyst focusing on homeland security at Rand Corporation, said cartels are decentralized and scattered across northern Mexico.

Adams said “it would be difficult to disrupt these dispersed operations through airstrikes or special operations alone.”

“In addition, any military action taken would likely compound the migrant situation at the border, and any action taken without cooperation of the Mexican government could threaten the productive relationship [U.S. Customs and Border Protection] has with Mexican law enforcement,” Adams told The Hill in a statement.

More widely accepted proposals to combat the drug trade are centered around stronger U.S.-Mexico cooperation, more public health initiatives and tighter gun control legislation, as cartels are generally armed with American-made weapons.  

But tragic incidents involving the cartels have heightened emotions and fueled calls for action in the U.S. 

In March, after four Americans were mistakenly kidnapped in Mexico by the Gulf Cartel, and two of the U.S. citizens died, some Republicans began clamoring to wipe out the criminal organizations.

Just days after the kidnapping, Sen. Tom Cotton (R-Ark.) said the deaths of 100,000 Americans every year from fentanyl is enough reason alone to authorize military force, backing the idea of special forces operations.

“Whatever you would do to ISIS or al-Qaeda killing 100,000 Americans every year, that’s exactly what our government should do to these cartels in Mexico,” Cotton told Fox News at the time.

U.S. officials have repeatedly warned against unilateral military action. 

Gen. Mark Milley, the chairman of the Joint Chiefs of Staff, said at a Defense One forum in late March that he wouldn’t “recommend anything be done without Mexico’s support.”

Milley emphasized the problem was a law enforcement issue best done in cooperation with other nations and local governments.

Melissa Dalton, the assistant secretary of defense for homeland defense and hemispheric affairs, said the U.S. could face steep consequences for the use of force.

“We need to be clear-eyed about what some of the implications might be,” she said at a March House hearing. “I do worry, based on signals, very strong signals we’ve gotten from Mexicans in the past, concerns about their sovereignty [and] potential reciprocal steps that they might take.”