Will Money Transfers Work To Get Mexico To Pay For The Wall

The centerpiece of Donald Trump's immigration policy — structure of a huge wall along the southern U.South. edge — has been hugely popular with his supporters.

But how does he plan to pay the estimated multi-billion-dollar cost to complete it?

Subsequently Mexican officials accept said they won't pay a "unmarried cent for such a stupid wall," Trump has come up up with another programme. He has proposed seizing a piece of the $25 billion in remittances that flow to Mexico every twelvemonth.

"It'southward an easy decision for Mexico: make a ane-time payment of $v-x billion to ensure that $24 billion continues to menstruation into their country year after year," according to the billionaire Republican candidate's website.

So, if Trump were elected, could he practise it?

"The notion that we're going to track every Western Union scrap of money that's beingness sent to United mexican states, y'all know, good luck with that," President Obama told reporters at a press conference on Tuesday.

For many developing countries around the world, the greenbacks that migrant workers send abode represents a major source of economic support.

Read More from CNBC: Mexico Won't Pay a Cent for Trump's 'Stupid Wall'

Worldwide, a tape 250 million migrants have left dwelling for a better life this yr, according to the Globe Bank. Those workers volition ship an estimated $601 billion to families back home, with developing countries receiving $441 billion, according to the bank.

The U.S. is biggest single source of those funds — with an estimated $56 billion outflow final twelvemonth — followed by Saudi Arabia ($37 billion) and Russia ($33 billion). Bharat took in the largest flow of remittances, with an estimated $72 billion last year, followed by China ($64 billion) and the Philippines ($xxx billion), according to World Bank data.

Mexico took in some $25 billion concluding year through such personal remittances. While that sounds like a lot of coin, it represents only a small fraction (well-nigh two percent) of United mexican states's gross domestic product.

Estimating the corporeality of coin transferred by individuals to Mexico every twelvemonth is difficult because official data business relationship only for funds sent through formal channels such as banks and money transfer services, co-ordinate to the Migration Policy Institute, a research grouping.

"Currently, no uniform and authoritative historical data on breezy flows exist," the Migration Policy Constitute said in a recent report. "Given the widespread use of informal remittance channels, the data should be regarded equally underestimates of full flows."

Most of that coin is coming from California, where more than than a third of Mexican immigrants live, according to the MPI. About one in v alive in Texas, and six percent live in Illinois.

For households in United mexican states's poorest regions, the remittances from family members living in the U.S. represent a critical financial life line. Cut off those remittances would hit households hardest that would to the lowest degree afford to lose that support.

Read More from CNBC: Trump Says He'll Block Money Transfers to Forcefulness Mexico to Pay for Wall

Under the Patriot Act, a authorities-issued identification is already required for routine coin transfers in the United States. For loftier-dollar transactions additional documentation or identification tin can be required.

Financial institutions must know their customers and are required to routinely share data with the government to ensure that their banking services aren't being used to wash money or fund terrorism, Matt Chandler, a erstwhile deputy chief of staff at the Homeland Security Section, told the Associated Press.

"Not only would making procedures more onerous for solar day-to-day transactions do little to actually improve anti-money laundering or counter-terrorism financing compliance programs, but could impairment those efforts by driving money motion abroad from routinely used secure channels to underground methods," Chandler told the AP.

While losing $10 billion in remittances would have a limited impact on United mexican states's $i.3 trillion economy, the full toll of Trump's immigration plan could exist much higher.

In addition to constructing a wall, Trump has proposed large-calibration deportation of all undocumented immigrants, not simply Mexicans.

It's tough to judge merely how much that would cost — a lot depends on the specific details of any deportation plan. But some researchers have taken a run at the question.

In March, American Action Forum, a eye-correct policy found led by onetime CBO director Douglas Holtz-Eakin, estimated information technology would take between $100 billion and $300 billion to arrest and remove "all undocumented immigrants residing in the country, a process that we estimate would take 20 years," the group said.

--- Reuters and the Associated Press contributed to this story.

John W. Schoen, CNBC

John W. Schoen is an award-winning online journalist, who has reported and written about economic science, business organisation and financial news for more than 30 years. He is economics reporter for CNBC.com, and was a founder of msnbc.com, CNBC and public radio's Marketplace.