Health and Human Services Secretary Alex Azar said that President Donald Trump signed an order for the U.S. to deny entry to foreign nationals who have traveled to China within the past two weeks, aside from the immediate family of U.S. citizens.
美国的新闻媒体没搞清楚？Yes. The terms 'foreign national" and "alien' are used interchangeably. ... Lawful permanent resident aliens, who have a resident alien registration card (INS Form 1-551), commonly known as a "green card," retain their foreign nationality and must be considered “foreign nationals" for the purposes of consular notification.
正解。非公民拒绝入境，公民或绿卡强制隔离。