All have been home to some of the migrant caravans that have marched through Mexico to the USA border.
The move is Trump's harshest yet as he escalates a confrontation with Mexico and the three countries that make up the "Northern Triangle" of Central America over the flood of immigrants pouring into the US southern border with Mexico.
The State Department said a day later that it would be ending foreign assistance programs for the Northern Triangle (Guatemala, Hondura and El Salvador) for fiscal years 2017 and 2018 at the president's direction.
Over the last two years, $1.3 billion was earmarked for Central America for United States official development aid, most of it to these three countries.
Trump repeated his threat on Friday to close the border between the U.S. and Mexico, and said he would act this week if Mexico didn't step up.
The State Department said it would "engage Congress in the process", apparently acknowledging that it will need lawmakers' approval to end the funding.
"Closing off the border makes no sense at all, '" the Maryland Democrat said Monday on CNN's "Newsroom".
"We stopped payment to Honduras, to Guatemala, and to El Salvador". In the meantime, he has repeatedly threatened to close the border, but this time, with a new surge of migrants heading north, he gave a definite timetable.
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"Most of this aid is meant to address the causes of migration - reduce poverty, violence, gangs, improve rule of law, and reform justice systems", said Senator Patrick Leahy, the senior Democrat on the Senate Appropriations Committee.
Mr Trump also threatened on Friday to close the USA border with Mexico next week if Mexico does not stop immigrants from reaching the United States, a move that could disrupt millions of legal border crossings and billions of dollars in trade.
Mario Garcia, a 45-year-old bricklayer in El Salvador, said he was setting off for the United States regardless of the president's threat to close the frontier.
Representative Norma Torres, a California Democrat, noted that Trump's decision to suspend aid would "undermine the many years of hard work by diplomats and aid workers, and would allow hundreds of millions of tax dollars in taxpayer funds already spent in the region to go to waste".
Trump told reporters at his Mar-a-Lago resort in Florida on Friday that the United States was paying the three countries "tremendous amounts of money", but received nothing in return.
According to the US Global Leadership Coalition, comprising retired diplomats, military leaders and members of Congress, aid programs in the three countries are working to address the "root causes of violence" in order to "promote opportunity and security for their citizens".
Critics argued the administration's planned Central America aid cutoff would be tantamount to cutting off its nose to spite its face.
Galvez believes one way the USA could cut down on illegal immigration from central America is through a combination of continued aid and economic investment in the region.