Republican U.S. presidential nominee Donald Trumpspeaks as Democratic U.S. presidential nominee Hillary Clinton listens during their third and final 2016 presidential campaign debate at UNLV in Las Vegas, Nevada, U.S., October 19, 2016. REUTERS/Mark Ralston

In early January, President-elect Donald Trump revived his promise to build a wall along the Mexico-US border (as well as his disdain for the media).

"Dishonest media says Mexico won’t be paying for the wall if they pay a little later so the wall can be built more quickly. Media is fake!" he tweeted on January 9.

The incoming administration may ask US Congress (and taxpayers) to foot the wall's bill, according to Republican lawmakers. Trump, however, said that Mexico would eventually pay for the project and reimburse the US. He and House Republicans are developing plans to fund the wall using taxpayer money through a 2006 law that put up 700 miles of barriers along the southern US border.

A substantial part of Trump's campaign focused on "the wall" and a deportation-centric, closed immigration policy. But now that he has won the election, it's still uncertain how anyone will actually build the 1,954-mile-long border wall.

Business Insider consulted a few architects to get some perspective on this question. They say the project would be nearly impossible (or, at the very least, unrealistic and a drain on US resources). Here are their reasons.

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The cost will be huge.

As CityLab points out, Trump is pledging to construct the largest infrastructure project since the US highway system and the Erie Canal. He has shared few logistic details about how it will be built, except that Mexico will eventually pay for it (though, Mexican President Enrique Peña Nieto said his country refuses to foot the estimated $25 billion construction cost), after the US starts the construction.

This giant price tag makes the project immediately infeasible, Rosa Sheng, a senior architect at the San Francisco-based firm Bohlin Cywinski Jackson, tells Business Insider.

"The US [is] currently as a $19-plus trillion deficit. Rather than spending our country's resources on building a wall, we should be focusing our energy on building bridges — both literal and figurative," she says. This includes "infrastructure improvements and transportation in major cities that support interstate supply chains, and alternative green energy production that will address not only climate change, but also challenge our dependency on fossil fuels."

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Historically, we have seen that building a wall requires a significant amount of money and time, Sheng adds. The Great Wall of China, for example, resulted in 400,000 deaths of the soldiers and convicts who built it.

"At such a great cost, we have to ask ourselves, 'could we be putting our country's economic and material resources to better use?'" she says.

The wall challenges the ethics of architecture.

William J. Martin, a freelance architect, says Trump's wall refutes the philosophy of architecture in and of itself.

"Architects design walls, not as barriers, but as a way to organize space," he tells BI. "Architects include features such as doors and windows which allow people to move through, and light to illuminate the other side."

Members of the American Institute of Architects (AIA) and the American Society of Civil Engineers, which include architects and engineers around the country, are both bound by codes of ethics, which might conflict with building a border-wall. The codes include statements like, "Members should uphold human rights in all their professional endeavors" and "exercise unprejudiced and unbiased judgment."