(CNN) President Donald Trump on Saturday said the deaths of migrant children at the border are "strictly the fault of the Democrats" after two children in the custody of US Customs and Border Protection died in recent weeks.

"Any deaths of children or others at the Border are strictly the fault of the Democrats and their pathetic immigration policies that allow people to make the long trek thinking they can enter our country illegally," Trump wrote on Twitter . "They can't. If we had a Wall, they wouldn't even try!"

An 8-year-old boy from Guatemala died on Christmas Eve at the Gerald Champion Regional Medical Center in Alamogordo, New Mexico, about 90 miles north of the border crossing in El Paso, Texas.

The boy -- who Rep. Joaquin Castro, chairman-elect of the Congressional Hispanic Caucus, identified as Felipe Gomez Alonzo -- was taken to the hospital on Monday after a border agent noticed signs of illness, and according to a CBP news release, "The child was held for an additional 90 minutes for observation and then released from the hospital mid-afternoon on December 24 with prescriptions for amoxicillin and Ibuprofen."

Later that day, the boy began vomiting and was taken back to the hospital for evaluation. He died hours later, CBP said.

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