Sen. Jeff Flake didn't realize his mic was still on after speaking at a tax reform event, telling Mesa, Arizona, Mayor John Giles: "If [Republicans] become the party of Roy Moore and Donald Trump, we are toast," according to Arizona's ABC affiliate.

Why it matters: Flake has been an outspoken critic of the Trump administration, as well as the current attitude in the Republican Party, especially since announcing he won't seek re-election. And there's a split in the party over Roy Moore because while many Republicans have spoken out against him, the President has stayed silent.

Sign up for Axios newsletters to get our Smart Brevity delivered to your inbox every morning.