Washington: The uproar over US President Donald Trump's travel ban has thrown the plight of immigrants into stark relief, but it also has engulfed skilled foreign workers.
In dramatic scenes over the past week, outraged demonstrators flocked to airports to support refugees and migrants trapped there or unable to board flights to the United States.
Major US tech companies that are highly dependent on foreign talent said hundreds of their employees could be affected, and joined in the opposition to the immigration limits, which initially swept up legal residents as well.
But Mr Trump and his team have long expressed goals that extend far beyond Silicon Valley, signalling they planned to establish a general preference for US workers over migrant job seekers in their "America First" economic policy.
Since taking office, Mr Trump has announced the ambitious goals of creating 25 million new jobs over the next 10 years and pushing economic growth to a torrid four percent, double the current rate.
Economists, however, say those goals will be difficult if not impossible to achieve without either delaying retirement for many older workers, admitting significant numbers of immigrants into the United States, or both.
'Destroy our jobs'
Some Trump advisors and associates have sought to frame the question of immigration as a fundamental contest over the nature of American society.
Chief White House advisor Stephen Bannon said in 2015 that the presence of Asians in Silicon Valley could undermine "civic society" - views that have been hailed by the extreme right.
But Mr Trump publicly has stuck to national security and economic arguments.
He pledged not only to prevent employers from outsourcing "cheap labour" by using the H-1B visa program for skilled workers, but also to "institute an absolute requirement to hire American workers first for every visa and immigration program".
And in his inaugural address, he declared the country should protect itself from foreign countries seeking to "destroy our jobs".
But under current economic and demographic trends, Mr Trump's goal of doubling economic growth and adding 25 million jobs by 2027 is incompatible with a clampdown on immigrants, economists say.
"The only way in which that statement really makes sense to an economist is if you increase the population," Jennifer Hunt, a former chief economist at the Labor Department, told AFP.
Ms Hunt, now at Rutgers University, served on a National Academy of Sciences panel which found that over the longer term, immigration was a significant benefit to the US economy, with "little to no negative effects" on the employment levels or wages of native-born workers.
During the 1990s, immigrants resulted in a significant increase in per capita economic growth through innovation.
"In 2000, GDP per capita from 1990 was between 1.5 percent and 2.5 percent higher than it would have been without the immigration since 1990," Ms Hunt said.
Amid an overall surge in patent registrations between 1990 and 2000, immigrants accounted for one third of new patents, she said.
'Wildly implausible'
Ian Shepherdson, chief economist at Pantheon Macroeconomics, said Mr Trump's goals were "wildly implausible" given the current size of the US labour force.
"There's just not the labour supply there to do it," he said, noting that employers already are finding it increasingly hard to fill vacancies, especially if Mr Trump goes ahead with a massive infrastructure plan.
Demographics also are playing a role through the aging of the US workforce.
Ben Zipperer of the Economic Policy Institute agreed that increasing immigration is one of the only ways of meeting Trump's job creation goal, since about one in four Americans is expected to be 65 or older in the next 10 years.
The US would still fall short of Mr Trump's goal by about nine million jobs even if each of five broad age groups matched their record employment levels from the last 50 years, he said in a blog post.
The current foreign-born labour force coincidentally numbers about 25 million people. "That's a sizeable part our economy," he told AFP.
"Efforts to reduce that and change the trend in negative ways are almost certainly going to shrink the workforce."
Nevertheless, Mr Trump has shown no sign of increasing immigration to meet the demand. The White House did not respond to a request for comment.
On the contrary, with Mr Trump in office barely two weeks, raucous protests have erupted over policies such as plans to erect a wall on the Mexican border, create a registry of crimes committed by immigrants, punish municipal governments that fail to enforce federal immigration laws, and ramp up certain deportations.
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