The Trump administration’s interim rule, set to take effect Tuesday, requires asylum-seekers to first pursue safe haven in a third country through which they travelled in route to the United States. Number 12,026 – better known as Marcial Artigas, 33, from Holguin, Cuba, waited nervously at a migration office at the U.S.-Mexico border as a Mexican official called out numbers from a long list of hopefuls waiting to cross to the United States. Marcial said he left Cuba in February, travelling to Nicaragua by plane before heading north through Central America and into Mexico by bus. If the new policy sticks, he could be required to apply for asylum in Mexico, or any one of the countries he passed through en route.