Protecting Children of Public Servants and Service Members Abroad Act of 2019 This bill nullifies certain U.S. Citizenship and Immigration Services (USCIS) guidance issued on August 28, 2019, as to what constitutes residence in the United States for the purposes of acquiring citizenship. (Residence in the United States is a requirement for acquiring citizenship in certain contexts. The guidance states, among other things, that [1] temporary visits to the United States do not establish U.S. residence, and [2] USCIS no longer considers a child living abroad with a parent who is a U.S. government employee or Armed Forces member as residing in the United States when determining whether that child automatically acquires U.S. citizenship.)