Since September, President Donald Trump and Defense Secretary Pete Hegseth have ordered controversial military strikes against boats in the Caribbean and Eastern Pacific.

The Trump administration has alleged with little evidence that the boats were smuggling drugs from Venezuela and Colombia. The campaign so far has killed more than 50 people, according to officials.

Venezuelan and Colombian leaders have refuted the administration’s grounds for the attacks and slammed Trump for his military action.

On Capitol Hill, some leaders from both parties have questioned the legality of the strikes and whether the president has the constitutional power to authorize them.

Here is a timeline of the operation.