Professor of Urban Planning Chris Tilly spoke to The New York Times about undocumented immigrants in the U.S. labor force. Many employers, particularly those offering low-paid jobs, say there are few alternatives to hiring workers without legal documents, the article noted. Tilly said that expectations and status play a role in Americans’ willingness to do blue-collar jobs. “Not everybody will do dirty work,” he said. Historically, the regulation of the U.S.-Mexico border has “been driven by the needs of the economy,” he said, but that is less true under the Trump administration, which has sought to check illegal border crossings.