Two candidates who want to win the 2018 Republican Senate primary in Arizona have responded very differently to President Donald Trump’s comments following violence that broke out before a scheduled alt-right rally in Charlottesville, Virginia, last weekend.

On the one hand, incumbent Sen. Jeff Flake has repeatedly launched veiled criticisms at Trump this week for his perceived soft response to the presence of neo-Nazis and white supremacists in Charlottesville.

Trump reiterated at a press conference Tuesday that “both sides” were to blame for the tornado of violence that swept through Charlottesville Saturday.

Flake responded to the president’s comments via Twitter.

“We can’t accept excuses for white supremacy & acts of domestic terrorism,” he wrote. “We must condemn. Period.”