Trump administration officials worried ahead of the announcement Tuesday of a phaseout of the Deferred Action for Childhood Arrivals (DACA) program that President Trump didn't fully understand what the move would mean.

Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE announced the decision Tuesday to end the Obama-era program, which allowed hundreds of thousands of young people who were brought to the country illegally as children to live here free from the fear of deportation.

The New York Times reported Tuesday that administration officials privately raised concerns as late as one hour before the announcement about Trump's understanding of the effects of rescinding DACA.

Officials worried that when Trump realized the full details of the decision on DACA, he might change his mind, according to the report.

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"The program known as DACA that was effectuated under the Obama administration is being rescinded," Sessions announced Tuesday.

Sessions said the program would be phased out and that no new applications from people who hope to be DACA recipients would be taken after today.

Trump tweeted Tuesday ahead of the announcement that Congress should be prepared to do its job and come to an agreement on the program.

"Congress, get ready to do your job - DACA!" Trump tweeted.