Dueling protests sprung up outside the Phoenix Convention Center on Tuesday before President Trump's campaign-style rally.
While dealing with high temperatures above 100 degrees, police set up barricades in Phoenix after thousands of protesters showed up to Trump's rally, according to the Los Angeles Times.
Anti-Trump protesters took aim at Trump during the rally by chanting "Lock him up," a spin the popular anti-Hillary Clinton chant following the investigation into the 2016 Democratic presidential candidate's private email server.
Some anti-Trump signs also addressed racially charged violence in Charlottesville, Va., earlier this month and Trump's controversial comments blaming "both sides."
Trump supporters rallying at the venue reportedly chanted "Build that wall! Build that wall" as police laid baricades around them.
Over 4,000 people said on Facebook that they would be attending a Protest Trump Downtown Phoenix rally just one block from the convention center.
According to the White House pool report, President Trump arrived at the Phoenix Convention Center for the rally, which is set to begin at 7 p.m. local time.