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MESA, AZ - APRIL 13:  U.S. Sen. Jeff Flake (R-AZ) speaks at a town hall event at the Mesa Convention Center on April 13, 2017 in Mesa, Arizona. It was the first such event this year for Flake, who is up for re-election in 2018, as Republican lawmakers across the country have been confronted with angry voters in similar settings.  (Photo by Ralph Freso/Getty Images)
MESA, AZ - APRIL 13:  U.S. Sen. Jeff Flake (R-AZ) speaks at a town hall event at the Mesa Convention Center on April 13, 2017 in Mesa, Arizona. It was the first such event this year for Flake, who is up for re-election in 2018, as Republican lawmakers across the country have been confronted with angry voters in similar settings.  (Photo by Ralph Freso/Getty Images)

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    Sen. Flake: I will not be complicit or silent

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Sen. Flake: I will not be complicit or silent

During his remarks on the Senate floor, Senator Jeff Flake (R-AZ) explains why the current political climate factored into his decision to retire at the end of his term.

Sen. Flake: I will not be complicit or silent

During his remarks on the Senate floor, Senator Jeff Flake (R-AZ) explains why the current political climate factored into his decision to retire at the end of his term.