Travel-related issues, including visa waiver restrictions, immigration, and infrastructure, have been at the forefront of the political debate so far among U.S. presidential candidates. While Republican candidate Donald Trump continues to steal headlines for his proposed ban on Muslim travel to the United States, other candidates are calling for renewed spending on travel infrastructure and increased security at American airports. Before the U.S. presidential primary season kicks off next week, Skift breaks down where the top presidential candidates stand on hot-button issues related to travel and tourism. Read more here.