In a June 26 decision, U.S. Judge Dana Sabraw of the Southern District of California ruled that the government must reunify the separated parents from their children, but made no stipulation that parents must be allowed to remain in the U.S. with their children while they wait for a judge to hear their asylum claim - a process that can take years.
Dubbed "Families Belong Together", the demonstration in Washington began at Lafayette Square where crowds gathered directly across from the White House before a planned march toward the Capitol.
Other cities in Canada that held rallies included Toronto, Halifax and Ottawa.
Starting in early May, in an attempt to staunch the flow of tens of thousands of migrants to the southern U.S. border every month, Trump ordered the arrest of adults crossing the boundary illegally, including those seeking asylum.
The footage of children, including toddlers, being held in detention centres incited outrage around the world.
Pérez said he would call it a "lie" that ICE has any real process for reuniting parents with their children before the parents are deported.
In three tweets, Trump called USA immigration laws "insane", railed against the potential hiring of more immigration judges, said the United States is the "only Country in the World that does this", and praised law enforcement at the border.
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The State Department and the Russian Foreign Ministry said they also discussed issues related to Syria and North Korea. The senators then met with representatives of the Duma, the lower house of the Russian parliament.
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North Dorset MP Simon Hoare said "the hectoring nonsense" and "blackmail" had to stop. Both have already been dismissed in principle by European Union officials.
Woman climbs base of Statue of Liberty in NY
Rise and Resist NYC says the banner was in response to the "sentiments of Saturday's nationwide End Family Separation protests". The agency is at the centre of the Trump administration's shelved policy of separating some immigrant families at the U.S.
News published a copy of the form it reported Immigration and Customs Enforcement officers are presenting parents separated from their children as a result of the Trump administration's family separation policy.
The mood was similar in NY, where Julia Lam, 58, joined the protest with two friends and their young children in strollers.
"I missed nine months of his life and it should never have happened", said the woman, who only gave her name as Jocelyn.
Lam is a mother and a retired fashion designer who emigrated from Hong Kong in the 1980s.
"I am angry. I'm very sad already with what is going on with our country".
The protests come after the US Supreme Court on Tuesday handed Trump a major victory by upholding his ban on travellers from five primarily Muslim nations. Next it will be all police. Kirstjen Nielsen-one of those ultimately responsible for implementing this barbaric policy-a group of USA senators called on the agencies to provide lists of separated children, their parents, and a "detailed briefing" on how they're reuniting them.