Foreigners applying for permanent residency in the US will now have to go back to their home countries to seek green cards.“From now on, an alien who is in the US temporarily and wants a green card must return to their home country to apply, except in extraordinary circumstances,” Zach Kahler, a spokesman for US Citizenship and Immigration Services, said in a statement on Friday.“This policy allows our immigration system to function as the law intended instead of incentivising loopholes,” Kahler said.The policy change could affect hundreds of thousands of people a year and potentially reduce legal immigration further amid a sweeping government crackdown, according to immigration-law experts.US President Donald Trump’s administration has introduced a series of restrictions affecting everyone from asylum seekers to students and highly skilled workers.US ‘gold card’ visa fails to lure rich Chinese #ytshortsThe new rules generally apply to any foreigner who came to the US on a temporary non-immigrant visa, including students, employees on H-1B or L visas and visitors.