Trump leaning toward ending DACA program for undocumented immigrants brought to US as children: Sources

But a senior administration official said Trump's thinking could change.

Trump has to make a decision before Sept. 5 when the 10-plus state attorneys general, led by Texas A.G. Ken Paxton, said they'd sue the Trump administration to end it and force the administration’s hand. Trump has to decide whether to defend the program or not, thereby ending it.

Though an announcement is likely next week, a senior administration official urged caution, noting that the president's thinking could always change.

Trump had told ABC News in January that people protected here under DACA, also called DREAMers, "shouldn't be very worried."

The most recent DACA numbers from March 31 show 787,580 initial grants of DACA and 799,077 renewals since the inception of the program in 2012. Those who qualified for DACA had to prove they came to the United States before age 16, were under the age of 31 as of June 15, 2012, lived here for at least five years continuously, attend or graduated from high school or college and have no criminal convictions.

Reps. Ileana Ros-Lehtinen, R-Fla., and Lucille Roybal-Allard, D-Calif., introduced a companion bill in the House, which goes a step further by allowing DREAMers a pathway to citizenship.

ABC News' Geneva Sands contributed to this report.