A new Hillary Clinton campaign advertisement features an Arizona politician -- Sen. Jeff Flake.
Flake appears alongside several other Republican legislators in criticizing Donald Trump.
"I can't vote for Donald Trump given the things that he's said," Flake says in the ad, which ultimately calls Trump "unfit" and dangerous."
Flake's office could not be reached for comment Monday, but the junior senator has been outspoken against the New York businessman.
Flake said last week that he would "keep speaking out" until Trump changes his campaign's tone.
That was in response to Trump calling Flake "weak" on Twitter.
The Republican Party needs strong and committed leaders, not weak people such as @JeffFlake, if it is going to stop illegal immigration.
— Donald J. Trump (@realDonaldTrump) September 4, 2016