​Where in the world is the U.S. trying to deport 3rd-country migrants?

U.S. President Donald Trump promised voters that if elected a second time, his administration would pursue mass deportations of those unauthorized to be in the country, and they appear to be looking far afield in pursuing that goal.

But the U.S. is now running roughshod over principles it has agreed to as a signatory to international refugee treaties and in its own legislation, say many organizations who advocate for refugees.

The principle of non-refoulement, in particular, is an obligation to not return migrants to countries of origin or third-party countries when their life or freedom would be threatened for reasons of race, religion or nationality, per the United Nations, or where they may subjected to human rights violations.

Those principles have been questioned in the courts as the U.S. has dealt with large flows of migrants at its borders. The previous administration only narrowly won a Supreme Court case allowing it to discontinue a program from Trump's first term, in which asylum seekers from other countries were sent to Mexico to await their U.S. refugee claims.

The Trump administration has revived that plan, called Migrant Protection Protocols, but refugee advocates say there was a lack of protection for many migrants waiting in Mexico the first time around, as several were allegedly subjected to kidnapping and attacks, including the alleged sexual assault of a young boy from El Salvador.

The U.S. in certain cases does not have expatriation agreements with the countries of origin for some of the migrants, but it is increasingly expelling people to third countries — without notice.

U.S. Secretary of State Marco Rubio said recently the goal was to expel "some of the most despicable human beings," but it's clear from reporting that many of the deportees don't fit that characterization.

Here's a look at some of the countries co-operating with the U.S., or reportedly in discussions with Washington.

It has been estimated that 200 migrants, including 80 children, have been deported so far to Costa Rica. The migrants sent to a rural camp in the Central American country hail from Afghanistan, Russia, China, Pakistan, India and elsewhere. 

Costa Rica has announced most of the deportees would be given three-month permits for humanitarian reasons, during which they can seek asylum there or arrange ways to leave for another country.

The terms of what the country agreed to with the White House have not been transparent, the country's English-language newspaper, the Tico Times, has reported.

President Rodrigo Chavez was forthright about the rationale for co-operating: "We are helping the economically powerful brother to the north, who if they impose a tax in our free-trade zone, it'll screw us."

The humanitarian organization Refugees International said the arrangements "appear to be a quid pro quo deal" to "facilitate human rights violations to avoid punitive U.S. economic measures."

At least on the surface, the Costa Rican government appears to be willing to protect the migrants.