Trump asserted in his tweets that Democrats support policies that "allow people to make the long trek thinking they can enter our country illegally".
"Border Patrol needs the wall and it will all end", Trump said in a followup message on Twitter in which he reflected on the deaths this month of two young Guatemalan children in the custody of USA border patrol agents.
Jakelin was pronounced dead in an El Paso hospital on December 8, 27 hours after she was arrested with her father, 29-year-old Nery Caal, and 163 others trying to enter the United States at the Antelope Wells Port of Entry in New Mexico.
"As I have said before, I ask Congress to please put politics aside and recognize this for the growing security and humanitarian crisis it is", she said, referring to illegal crossings at the border. "They are working so hard & getting so little credit!"
The visit came amid promises of additional wellness screenings for migrant children.
Both children were from Guatemala, which for most of the last 50 years has been torn apart by guerilla conflict, ethnic massacres, dictatorships and poverty. A Border Patrol emergency technician revived her twice.
President Donald Trump is denying that his administration bears any blame for the deaths of children detained trying to cross the U.S. -Mexico border, even as his Homeland Security secretary was traveling in Arizona to meet with medical staff.
Eight-year-old Felipe Gomez Alonzo (left) died of not-yet-determined causes on Christmas Eve.
The tweet came as Trump said he was waiting for Democrats to come back to negotiate a deal to end a week-long partial government shutdown that will nearly certainly extend into the new year.
Washington is now in the throes of a partial government shutdown, triggered over Mr Trump's demands for billions of dollars in funding to build a wall along the US-Mexico border.
The record so far as is known neither establishes that US officials were to blame nor clears them of blame, despite Trump's pronouncement.
More than 68,500 were "family units" while nearly 14,000 others were unaccompanied children, she said, and the system has been pushed to the "breaking point".
"That's not a capacity we've had in the past", McAleenan said.
At 7:45 a.m., a helicopter flew her to the nearest trauma center, in El Paso, Texas, where she went into cardiac arrest late that morning and was revived once more.
Taped to the wall are three photos, alternately smiling and serious, bearing a simple epitaph for the boy whose memory the makeshift altar honours: "Felipe Gomez Alonzo".
But as he tries to build pressure on Democrats to help fund the border wall he sees as an urgent priority - threatening even to close the border if no deal is reached - Democrats appear adamant in their refusal to pay for a project they view as a waste of money. He had been in the custody of U.S. Customs and Border Protection with his father since December 18.
Democratic US Representative Hakeem Jeffries said the country needs comprehensive immigration reform and border security. As of Friday, almost 150 children had been screened under the new procedures and at least four had been admitted to an area hospital, according to the Border Regional Advisory Council, a non-profit that is helping coordinate the check-ups. New Mexico authorities say an autopsy revealed the boy had the flu, according to The Associated Press.