YUMA, Ariz. — Fresh off a speech on Afghanistan that moved him in a different direction from many of his core voters, President Donald Trump is highlighting his pledge to combat illegal immigration by visiting a Marine Corps base along the U.S.-Mexico border Tuesday.

Trump also scheduled a nighttime rally in Phoenix, which left local officials concerned that emotions may run hot among those inside and outside of the hall so soon after Trump blamed “both sides” for violence at a rally organized by white supremacists in Charlottesville, Virginia.

Even before the rally began, protesters were engaged in minor scuffles and shouting matches with Trump supporters as hundreds of people lined up to get inside the Phoenix convention center and the temperature soared above 100 degrees. At one point, police officers formed a line in the middle of a street to separate the protesters and Trump supporters. In one exchange, a Trump supporter and protester shoved each other.