US President Donald Trumpsaid migrants were violently changing Europe's culture.
The children are believed to be between 4 and 10 years of age, and they're crying because their parents have been detained elsewhere after crossing the U.S. -Mexico border, according to an activist who provided the recording.
Photos went viral over the weekend showing children being held in fenced enclosures at a Texas facility.
Attorneys at the hearings said the immigrants had brought two dozen boys and girls with them to the USA, and the judge replied that he didn't know what would happen to their children. Reuters could not independently verify its authenticity.
All four former first ladies have joined the current one, Melania Trump, in an unusual united political front expressing horror at children separated from their parents at the U.S. -Mexico border.
Attorney General Jeff Sessions has justified the fracturing of families by quoting The Bible.
Over the weekend, millions of people shared the gone-viral photo taken by photographer John Moore, of a two-year-old girl crying and screaming while a US border agent detained her mother. "They could be murders, thieves, and so much else".
"Jesus said suffer the little children unto me - he did not say let the children suffer", Clinton continued, citing a Bible verse.
Conway also blamed the Democrats, saying if there are serious about overhauling the immigration system, "they'll come together again and try to close these loopholes and get real immigration reform".
Trump has sought to use the widespread outrage over the family separations to push through other immigration priorities that have stalled in Congress, such as funding for his long-promised wall along the Mexican border.
During a speech on Monday at an awards ceremony for the Women's Forum of New York, Hillary Clinton said: "What's happening to families at the border right now is a humanitarian crisis".
"The United States will not be a migrant camp, and it will not be a refugee holding facility".
White House press secretary Sarah Huckabee Sanders didn't directly defend Sessions' quoting of the Bible, but suggested it's religiously prudent to enforce the law.
The White House also has interpreted a 1997 legal agreement and a 2008 bipartisan human trafficking bill as requiring the separation of families - a posture not taken by the George W. Bush or Obama administrations. Medical professionals have said the practice could cause lasting trauma to children.
"All Americans are rightly horrified by the images we are seeing on the news, children in tears pulled away from their mothers and fathers".
Over the last five years, though, migrants have figured out how to exploit that system, realizing they can get more lenient treatment if they arrive as families, and figuring that if they claim asylum, even with dubious cases, they can often get released into the USA where they can disappear into the shadows.
"This was done by the President, not Democrats", Senate Democratic Leader Chuck Schumer said in a statement. "Change the laws!" he said in a separate tweet.
"Mrs Trump hates to see children separated from their families and hopes both sides of the aisle can finally come together to achieve successful immigration reform", Mrs Trump's communications director Stephanie Grisham said in a statement to CNN. Details were still in flux. You're seeing people marching on the border. and it's another example of a policy that Democrats will be motivated against. The House is expected to vote this week on a bill pushed by conservatives that may not have enough support to pass, and a compromise measure that includes key proposals supported by the president.
Yet it's unclear whether Republican leadership would put a "clean" bill on the floor that blocks Trump from separating families, or would instead push for broader legislation. Nearly 52,000 people were caught trying to cross the southern border illegally in May, according to government figures.