Document 3: President Trump proposed stopping many Muslim immigrants from entering the United States when he ran for president in 2015. The plan was criticized by both political parties. Within a week of taking office, the first travel ban was announced with little warning. People protested the rule across the nation. The travel limits have changed since then. They still remained a key part of Trump's "America First" vision, though. The president believed that the limits would make the United States safer from possibly dangerous foreigners from other countries. What is the main idea of this document? *