s policy of separating families at the border letter to the department of health and human services expressing concerns about the use of dna testing in the reunification of families who have been separated at the border letter to oversight and judiciary committees demanding that they hold a hearing to require steve bannon to testify about his interactions with law enforcement surrounding the 2016 election letter to united states department of agriculture (usda) secretary perdue urging him to issue guidance to schools to end the practice of lunch shaming, which are policies in schools that isolate or embarrass students who receive free or reduced-price lunch letter to secretary of state pompeo and national security advisor john bolton urging them torelease all humanitarian aid to gaza letter to the acting administrator of the environmental protection agency opposing the administration?