He called for secure borders and an end to sanctuary cities, support for more choices in public education, and for more scrutiny of "pay-to-play" science research.[34] Ayyadurai has accused Warren of voting in favor of the Farmer Assurance Provision and against a GM labeling bill sponsored by Senator Bernie Sanders of Vermont.[35] However, the Act was reportedly passed to avoid a government shutdown,[36] and Warren petitioned the Food and Drug Administration for "regulations to ensure that the labeling of GMO products is fair, standardized and transparent."[37]