Trump's plan to build a wall along U.S.-Mexico border faces great hurdles

WASHINGTON - Can Donald Trump really make good on his promise to build a wall along the 3,200-kilometre U.S.-Mexican border to prevent illegal immigration? What's more, can he make Mexico pay for it?

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Sure, he can build it, but it's not nearly as simple as he says.

Constructing the wall, now a signature applause line at Trump campaign rallies, is a complicated endeavour, fraught with difficulties. Numerous bureaucratic, diplomatic, environmental, monetary and logistical hurdles must be overcome.

And forcing the Mexican government to foot the bill won't be easy, especially since its president has flat-out refused.

A physical barrier between Mexico and the United States has been tried before.

During President George W. Bush's second term, Congress authorized $1.2 billion to build several hundred kilometres of double-layer fencing but the government faced myriad obstacles. Private landowners objected to buyout offers. There were environmental concerns and lawsuits.

Some 1,050 kilometres of fencing now sits on the border, including roughly 4.5-metre tall steel fencing in many urban areas that is designed to stop or slow border crossers on foot and vehicle barriers, which are shorter steel posts filled with cement and planted in the ground.

Just getting that built was a challenge and a new, taller wall like the one Trump wants would almost certainly face as much, if not more, opposition.

First, a 1970 boundary treaty governs structures along the Rio Grande and Colorado River at the Mexican border. It requires that structures cannot disrupt the flow of the rivers, which flow across Texas and 39 kilometres in Arizona, define the U.S.-Mexican border, according to The International Boundary and Water Commission, a joint U.S.-Mexican agency that administers the treaty.

Trump has said his wall will not need to run the full 3,360-kilometre length of the border but even excluding those portions blocked by geographic features, there are serious issues.

In some places, treaty obligations and river flood zones would require the wall be built well into the United States, which would be awkward if the Mexican government is paying for it and overseeing the project. In addition to creating a sort of no-man's land between the wall and the actual border, one government or the other would have to buy large amounts of private property as well as land owned by at least one Indian tribe whose territory straddles the border in southern Arizona.

In areas where the border is defined on dry land across New Mexico, most of Arizona and California, structures have to be built so that the wall doesn't obstruct natural run off routes or otherwise induce flooding. Building in those areas can be complicated and costly. In sensitive sand dunes in Southern California, for instance, a "floating fence" had to be built to allow the natural movements of the dunes.

Then, there are the conservation issues. Groups such as Defenders of Wildlife and the Sierra Club sued over parts of the existing partial fence. And, federal regulations could prevent or at least significantly delay or increase costs of construction in certain areas.

A total of 18 federally protected species may be found along certain sections of the California border and at least 39 federally endangered, threatened, or candidate species live along the Arizona border, according to the U.S. Fish and Wildlife Service.

Presuming Trump can overcome all of these bumps, he must also contend with the cost and the diplomatic consequences.

Numerous fact-checking organizations have taken issue with Trump's estimate that the wall would be built for $10 billion to $12 billion. And, they have rejected his contention that the wall could be funded by reducing the U.S. trade deficit with Mexico. Figures released by the Army Corps of Engineers and the Congressional Research Service indicate that the total cost of the current 1,050 kilometres fence has been $7 billion. And that doesn't include maintenance and upkeep.

Trump has insisted that Mexico will pay for the wall, perhaps through fees on money that immigrants send home to their families, tariffs or other means. Fees would be wildly unpopular and tariffs would likely run afoul of the North American Free Trade Agreement. The cost of such tariffs would also ultimately be borne by U.S. consumers.

Getting the Mexican government to pay for it outright is almost certainly wishful thinking.

President Enrique Pena Nieto said Monday that "there is no scenario" under which Mexico would pay for the wall and likened Trump's rhetoric to that of Hitler and Mussolini. Former President Vicente Fox put it more bluntly: "I am not going to pay for that f---ing wall." Both Fox and another former president, Felipe Calderon, have also compared Trump to Hitler.

So there's diplomatic ill will, a question the Congressional Research Service raised in 2009.

"Do the gains in border security outweigh the risk of alienating Mexico and Canada?" it asked. "Should the Mexican or Canadian government's opinions or wishes be taken into account when border fencing is concerned? Given the need to co-ordinate intelligence and law enforcement activities at the border, should maintaining cordial working relationships with Mexico and Canada take precedence over sealing the border with physical barriers?"

And, on Wednesday, a group of Republican national security community members, including former government officials, blasted the idea.

"Controlling our border and preventing illegal immigration is a serious issue, but his insistence that Mexico will fund a wall on the southern border inflames unhelpful passions, and rests on an utter misreading of, and contempt for, our southern neighbour," they wrote in an open letter critical of Trump.



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