More than 75 professors from Arizona's three state universities have signed a national petition denouncing President Donald Trump's executive order on immigration as discriminatory and detrimental to the country. Over the weekend, Association of Public and Land-grant Universities President Peter McPherson said the ban is causing "significant disruption and hardship" to university students, researchers and staff who are from the seven countries. The group represents 237 public research institutions, including the UA. He said students who are stranded abroad will be unable to return to their studies."This means that students’ work toward degrees are in question and the ability of faculty to continue teaching or conducting research is uncertain," he said in a statement.