Donald Trump has claimed that immigrants crossing the border illegally will "infest" America without strong laws, as the outcry over a policy of separating families at the border continues to build.
The family separations are part of a "zero tolerance" policy of dealing with illegal border crossings, where all adults are prosecuted - leaving any children to be housed in detention centres while cases are processed. The policy was announced last month by Attorney General Jeff Sessions but is not codified in US immigration law, particularly that relating to seeking asylum.
Images of children fenced in, in wire mesh cages, and audio of screaming young boys and girls being separated from their parents has led to a backlash from Democrats and some within Mr Trump's own Republican party.
Democrats have hurled charges of “barbaric” treatment of children and decrying what they have labelled harsh and demeaning language the president as used, with Mr Trump falsely blaming them for not helping Congress deal with the issue of the separations.
He returned to that accusation in his morning tweet: "Democrats are the problem. They don’t care about crime and want illegal immigrants, no matter how bad they may be, to pour into and infest our Country, like MS-13. They can’t win on their terrible policies, so they view them as potential voters!"
Mr Trump has constantly sought to contrast what he claims are soft Democrat positions with his hardline, and controversial, stance on immigration, often using hyperbole. The reference to the MS-13 gang is a callback to his election promise to rid the country of members of the violent group, which has its origins in Central America. That promise was a central pillar of his 2016 election campaign.
Given those promises, Trump administration officials - such as Mr Sessions and Department of Homeland Security Secretary Kirstjen Nielsen - have said they "will not apologise" for following the law and it is up to Congress to being new legislation to change the rules.
More than 2,300 children were separated from their parents from 5 May to 9 June, according to Department of Homeland Security figures. With potentially hundreds more separated thanks to a policy that started in mid-April.
Mr Trump is due to travel to Congress on Tuesday evening to discuss wider immigration reform with Republicans. Ahead of that visit two top conservatives announced they would be introducing bills to stop the practice of the separations.
Senator Ted Cruz of border state Texas introduced legislation that the White House said it was reviewing, and Representative Mark Meadows of North Carolina, a leader of the conservative Freedom Caucus, also introduced a measure.
Both bills were offered as alternatives in case broader GOP immigration legislation heading for a vote this week fails, as is likely. “This becomes a backup proposal,” Mr Meadows told reporters at the White House.
Two Republican bills are currently having the finishing touches to them by Mr Trump’s party. The first is a hard-right proposal, the second the more moderate plan negotiated by the party’s conservative and centrist wings, with White House input.
Only the latter would open a door to citizenship for young immigrants brought to the US illegally as children, and reduce the separation of children from their parents when families are detained crossing the border. Leaders released a schedule for next week that included “possible consideration” of immigration legislation.
Tensions are already high in Congress, with the border issuing affecting a House hearing on an unrelated subject when protesters with babies briefly shut down proceedings.
Maryland Representative Elijah Cummings, the top Democrat on the House Oversight and Government Reform Committee, teared up as he pleaded with Republicans on the panel to end what he called “internment camps” for those crossing the border.
“We need you, those children need you —and I am talking directly to my Republican colleagues— we need you to stand up to President Donald Trump,” he said.
Criticism of the policy has come from all sides. All five living US first ladies including Laura Bush, wife of Republican President George W Bush, and Melania Trump have made clear feelings over the policy. Ms Bush, who has been the first lady of the state of Texas as well, called the policy "cruel" while Ms Trump said she "hates to see" children separated from their parents.
Internationally, France's government spokesman called the images of the children in detention centres “shocking” and that the policy shows the US and Europe now has different "values" on certain issues..
“We do not share the same model of civilisation, clearly we don't share certain values,” Benjamin Griveaux told France 2 television.
Despite Mr Trump and his surrogates' claims, the administration actually has unilateral ability to rescind the policy which makes seeking asylum a crime.
The president's claim that "it's Democrats' law" is false. There is no clause in current US immigration law or court precedent that compels family separation. The Obama and Bush administrations had been housing children, as Trump officials have claimed, but those were unaccompanied minors who had fled the violence of their home countries and crossed the border without any adults.
The previous administrations were also arresting people travelling in families, but it was not immediate and parents had the chance to formally apply for asylum - for which you have to be in the US to do per the law - and could remain in the country while waiting for their hearing. This is what was referred to as the "catch and release" policy Mr Trump has vilified.
White House press secretary Sarah Huckabee Sanders justified the policy late last week by describing it as biblical: “It is very biblical to enforce the [particular immigration] law, that is actually repeated a number of times throughout the Bible.” Several church groups have criticised the policy as needlessly harmful to children.
But the issue will likely dominate the airwaves and other media until a solution is found. The attorneys general of 21 states called on Jeff Sessions in a letter released on Tuesday to stop endangering children by separating them from their families.
“Put simply, the deliberate separation of children and their parents who seek lawful asylum in America is wrong, said Hector Balderas, the attorney general in the border state of New Mexico. "This practice is contrary to American values and must be stopped”.
