President Trump’s new moves Monday to suspend several types of work visas are aimed at setting aside over half a million jobs for poor and middle-class Americans laid off during the coronavirus crisis and stopping chain migration, which substantially boosts immigration to the United States.

In expanding his April 26 pause of green cards to multiple types of work visas, the president is “making sure that these jobs go to Americans,” said a senior administration official. The jobs targeted range from mid-level tech positions to crab processing plants to summer jobs at the beach.