Trump also downplayed the claims of people seeking asylum at the border, declaring without evidence that many were gang members while comparing some of their efforts to find safety in the USA to the special counsel Robert Mueller's investigation of Russian interference in the 2016 elections.
President Trump claimed Friday that "our country is full" as he tried to warn off migrants arriving at the southern border in increasing numbers, and threatened Mexico with automobile tariffs if the country doesn't step up its efforts to curb migration from Central America. We can't take you.
"Our country is full", Mr Trump said, in a warning to would-be migrants.
"So turn around, that's the way it is", he said.
U.S. President Donald Trump speaks during a White House Opportunity and Revitalization Council meeting in the Cabinet room at the White House in Washington, U.S., April 4, 2019.
"If you look at our southern border, the number of people and the amount of drugs, human trafficking - the human trafficking is something that nobody used to talk about, I talk about it".More news: Clemson star Alice Hewson enjoys experience of Augusta National Women's Amateur
Harvard professor Ieva Jusionyte wrote in his book Threshold about his experiences working as an emergency medical technician (EMT) on both sides of the US border with Mexico. "Build the wall", said one placard.
Until Thursday, the White House had been signalling that Trump could imminently order a full or partial closure of the huge border in response to what Trump says is a "crisis" and "national emergency".
For example, many so-called "Unaccompanied Alien Children" are being smuggled up the border because Trump's agencies will pass them to their illegal immigrant parents living throughout the United States, under policies set by Obama. "I know about hoaxes, I just went through a hoax", he said at one point, indicating 'Russiagate'. "If that doesn't work, which it will, I will close the Border", he wrote.
President Trump touched-down in southern California Friday to tour recently constructed segments of his border wall; highlighting the importance of security throughout the region weeks after declaring the area a "national emergency".
The idea caused alarm among economists and Congress, including in Trump's Republican Party. The auto tariff, he added, "supersedes" the new US-Mexico-Canada Agreement on trade.
It was not immediately clear what other penalties he was considering.More news: Ethiopian crew followed procedures: first official crash report
"If for any reason Mexico stops apprehending and bringing the illegals back to where they came from, the USA will be forced to tariff at 25 percent all cars made in Mexico and shipped over the border to us".
The majority of the migrants are from the Central American countries of Guatemala, Honduras, and El Salvador, which means they mostly travel through Mexico to get to the United States.
The suit by the state attorneys general is not the only legal challenge Trump faces.
Mexico is doing a "really great job" at "grabbing and taking" people, he said. In Mexico City, President Andres Manuel Lopez Obrador urged investors to "stay calm".
Mike Vigil, a former chief of global operations for the U.S. Drug Enforcement Administration, said the amount of drugs smuggled into the United States annually was probably in the range of $50-$60 billion.More news: US Democrats officially request Donald Trump's tax returns from IRS