President Donald Trump said the U.S. may carry out military strikes on land to stop drugs from Venezuelan cartels entering the United States.

He noted that while maritime routes are largely under control, land operations are now being considered.

The comments followed reports that the Trump administration secretly authorized the CIA to take covert action in Venezuela against President Nicolás Maduro’s regime.

Since September, the U.S. military has attacked five boats in the Caribbean, killing 26 people, whom Trump called “narcoterrorists,” USA Today has reported.

Critics have questioned the legal justification for these strikes, as evidence that the boats were carrying drugs has not been presented to Congress.