WATCH: GOP Sen. Jeff Flake gives impassioned speech on Senate floor, slams Trump politics

WASHINGTON – Arizona Republican Senator Jeff Flake announced he won't run for re-election in 2018 on Tuesday during a speech on the Senate floor.

Sen. Flake took aim at the politics of President Trump and his colleagues. Some notable lines include:

• "Why didn't you speak up? What are we going to say? Mr. President, I rise today to say, enough."
• "We must stop pretending the degradation of our politics and conduct of some in our executive branch are normal. They are not normal"
• "There are times when we must risk our careers in favor of our principles. Now is such a time."
• "I have children and grandchildren to answer to, and so Mr. President, I will not be complicit or silent."

Watch Jeff Flake's speech below: