"The president likes the idea and Democrats have said they want these individuals into their communities, so let's see if it works and everyone gets a win out of it," the White House press secretary said.
"We can give them an unlimited supply. And let's see if they're so happy," Trump said.
Kirstjen Nielsen's replacement, U.S. Customs and Border Protection Commissioner Kevin McAleenan, who will serve as acting secretary, also defended Border Patrol's use of tear gas to repel migrants.
"Oh my god, there's a lot of poverty in this world, and you're going to have people from all over the world. And I don't think that's something that we can do at this point," Senator Bernie Sanders, a 2020 presidential contender, said in Iowa.
"Mexico understands that we're going to close the border or I'm going to tariff the cars," the president said.
"The Hill to Die On," by Politico journalists Jake Sherman and Anna Palmer, paints Jared Kushner as naive and arrogant.
The president began threatening to close the southern border and pushing for Republicans to try to repeal and replace Obamacare, before backtracking.
Detainees were forced to sleep on the dirt outside in 37-degree temperatures with only thin sheets, the ACLU said in a complaint filed with the Department of Homeland Security.
"Before our fence went up, we were a safe city. After a fence went up, which was a replacement of a chain-link fence that had holes in it, we were still safe."
"You couldn't pick a worse time of year, because Mexico supplies virtually 100 percent of the avocados in the U.S. right now," said the president and chief executive of Mission Produce.
Sunday morning's Fox & Friends applauded President Donald Trump's directive to cut aid to Central American countries by declaring, "Trump Cuts U.S Aid to 3 Mexican Countries."
The Trump administration's apparent dismissal of human rights monitors "puts the United States squarely in the company of some of the worst human rights abusers around the world."
As of late last week, a total of 2,287 detainees had been quarantined in facilities across the U.S., according to the U.S. Immigration and Customs Enforcement agency.
"They're people coming up here for economic purposes. I don't blame them for that," John Kelly said.
Homeland Security Secretary Kirstjen Nielsen took issue with the use of the word "cages" to describe the detention facilities used for children.
At least 186 people between the ages of 13 and 66 have reportedly contracted the virus at Texas immigration detention centers.
Border enforcement authorities announced Tuesday that more than 76,000 migrants crossed the U.S. border with Mexico without authorization last month.
The general in charge of U.S. military operations in North America dodged questions Tuesday on what specific threat at the southern border justifies President Trump declaring a national emergency.
World Health Organization dispels the falsehood that irregular migrants and refugees spread sickness among host communities in Europe.
Most of the 376 people who entered the country on Monday crawled through holes dug by smugglers.
"Thousands of children may have been separated during an influx that began in 2017, before the accounting required by the court, and HHS has faced challenges in identifying separated children," a new government report said.
Undocumented migrants pay more than $20 billion in taxes annually, according to the IRS.