The administration's unified front came as some Republicans and their supporters, from former first lady Laura Bush to evangelist Franklin Graham, have spoken out against the policy.
About 2,000 children were separated from their families over a six-week period ending in May.
Mrs. Clinton, former first lady, secretary of state and Democratic presidential nominee, said at an awards lunch for the Women's Forum of NY that the separations are not required by law and are not grounded in any religion.
The family separations are the result of the administration's "zero tolerance" policy that arrests all adults who are caught trying to enter the U.S. illegally, including those seeking asylum. Children are not detained with their parents when those parents are facing a criminal charge, as per USA protocol.
The House may put forward a compromise bill that reverses a court settlement, allowing children to be held with their parents by the Department of Homeland Security. Bush said on Twitter as she shared her column.
"I appreciate the need to enforce and protect our worldwide boundaries, but this zero-tolerance policy is cruel", she wrote. "It is immoral. And it breaks my heart", Mrs.
His wife, who seldom wades into the political arena, opted to call for bipartisan immigration reform to fix the issue, rather than denounce the policy.
Mrs. Trump "believes we need to be a country that follows all laws, but also a country that governs with heart", Stephanie Grisham, a spokeswoman for Mrs. Trump, said Sunday.
Microsoft came under fire on social media for its contract with U.S. Immigration and Customs Enforcement, the agency that's separating families at the U.S.
Democrats blasted such treatment as "barbaric", while a few of President Donald Trump's fellow Republicans also voiced concern as the Republican-controlled U.S. House of Representatives moved toward voting later this week on two pieces of immigration-related legislation.
While the statement suggested the matter was an issue for Congress, Democratic lawmakers and others have pointed out that no law mandates the separation of children and parents at the border.
Immigration changes could be accomplished "very quickly" if Democrats would negotiate in good faith, the president said.
Gaming disorder could soon be treated in public health sector
The new ICD also includes for the first time a chapter on traditional medicines, used by millions of people around the world. WHO has said that gaming disorder is a serious health condition that requires monitoring.
In another tweet, he contended that children "are being used by some of the worst criminals on earth as a means to enter our country". "It could take place quickly".
He continued, "Trump and Sessions say they are following laws". But he said security was paramount.
"The United States will not be a migrant camp, and it will not be a refugee holding facility". He added that "a country without borders is not a country at all. We need to protect all children". "We have to take care of our people".
"The administration is arguing that by inflicting this harm, on children and parents, this stress, they're sending a message, a deterrent message, for people not to seek asylum in the United States", he said. "As everyone who has looked at this agrees, this was done by the president, not Democrats", Schumer tweeted Monday. The German Interior Ministry announced last month, however, that the total number of crimes committed in the country in 2017 had fallen 5.1 percent from the previous year.
Trump, who has made a tough stance on immigration a major goal of his presidency, responded sharply to critics on Monday.
"We don't want what is happening with immigration in Europe to happen with us!" "We have to do our job".
"We are doing none of those things".
The trauma that separation from parents can cause for children has led the American Academy of Pediatrics and the Child Welfare League of America, among others, to strongly urge the White House and the Department of Homeland Security to stop breaking up families.
Administration officials said they do not like the family separations either - calling it the result of legal loopholes - but insist migrants who arrive illegally simply won't be released or loosely kept track of. As Administration officials have freely admitted, the practice of throwing immigrant parents into the criminal justice system, and their children into federal foster care for days and sometimes weeks, is meant to intimidate and instill fear in people who are already fleeing from awful violence and repression in their home countries. "We can not and will not encourage people to bring children by giving them blanket immunity from our laws", he said. "We can end this crisis by passing the legislation I am introducing", the Texas lawmaker said.
Hillary Clinton, speaking at a women's event in NY, said the Trump administration's "zero tolerance" policy that has separated children and parents at the southern border was a "moral and humanitarian crisis".
She said it was "eerily reminiscent of the Japanese American internment camps of World War II", which she said are "now considered to have been one of the most shameful episodes in USA history".