Some 2.5 million Salvadorans, 2.7 million Guatemalans and one million Hondurans live in the United States and send remittances to their families every month.
Amnesty International said the deployment of armed police and military personnel in front of the legislature brought back memories of the darkest moments in El Salvador's history.
The US Secretary of State, Mike Pompeo, said in a statement that he informed Congress of his intention to resume foreign aid for El Salvador, Guatemala and Honduras.
