Tens of thousands of people have joined nationwide protests across the US over the Trump administration's hardline immigration policies.
More than 630 events were planned, with protesters calling for migrant families split at the US border to be reunited.
Some 2,000 children remain separated from their parents, despite President Donald Trump bowing to public outrage and curtailing the policy.
Concerns remain that records were not kept linking parents and children.
Major protests took place in Washington DC, New York, and many other cities, using the hashtag #familiesbelongtogether. Marchers held placards calling for no more family separations and for the controversial immigration agency ICE to be abolished.
The nation is deeply divided about immigration policy, and the president ignited the debate again with his tweets on Saturday.
From his golf resort at Bedminster, New Jersey, he defended the US Immigration and Customs Enforcement (ICE) on Twitter, describing it as the "smartest, toughest and most spirited" of law-enforcement groups.
Meanwhile the movement to abolish ICE has been "going mainstream", according to some activists, and thousands have taken to the streets to protest the president's policies.
More than 100 protesters gathered near the president's resort ("My civility is locked in a cage", said one of their signs). I drove past the protesters on my way to the resort where I spent part of the day. As demonstrations heated up in New Jersey and across the US, the president was doubling down on his effort to promote his hardline policies.
"It goes against everything we stand for as a country," one protester, Paula Flores-Marques, 27, told Reuters in front of the White House in Washington DC. President Trump was out of town.
In New York they chanted, "Say it loud, say it clear, refugees are welcome here". In Chicago, protesters marched to the local offices of federal immigration authorities.
The original Trump administration "zero tolerance" policy required authorities to arrest and detain anyone crossing the Mexico-US border illegally. That meant separating children from their parents and holding them separately.
Faced with a massive public outcry after recordings were published of distressed, crying children in detention centres, President Trump promised to "keep families together" in migrant detention centres.
But critics say the order did not address the issue of families already separated, leaving uncertainty over the fate of 2,342 children taken away from their parents between 5 May and 9 June alone. Earlier this week, a judge in California ordered the families to be reunited within 30 days.
It also still requires authorities to detain immigrant families, rather than release them with a court date to return.
Organisers said they wanted to send a message to President Trump, prompted by concerns that he would renege on his executive order.
"We cannot slow down now since the court ruling alone isn't enough and could be overturned," said a statement on the movement's website.
BBC
