The following is excerpted from Arizona Sen. Jeff Flake’s speech Tuesday on the Senate floor. Flake, a Republican, announced he would not seek re-election in 2018.

I rise today with no small measure of regret. Regret because of the state of our disunion. Regret because of the disrepair and destructiveness of our politics. Regret because of the indecency of our discourse. Regret because of the coarseness of our leadership.

Regret for the compromise of our moral authority, and by our, I mean all of our complicity in this alarming and dangerous state of affairs. It is time for our complicity and our accommodation of the unacceptable to end. In this century, a new phrase has entered the language to describe the accommodation of a new and undesirable order; that phrase being the new normal.

But we must never adjust to the present coarseness of our national dialogue with the tone set up at the top. We must never regard as normal the regular and casual undermining of our democratic norms and ideals. We must never meekly accept the daily sundering of our country. The personal attacks, the threats against principles, freedoms and institution, the flagrant disregard for truth and decency.

The reckless provocations, most often for the pettiest and most personal reasons, reasons having nothing whatsoever to do with the fortunes of the people that we have been elected to serve. None of these appalling features of our current politics should ever be regarded as normal.

If we simply become inured to this condition, thinking that it is just politics as usual, then heaven help us. Without fear of the consequences and without consideration of the rules of what is politically safe or palatable, we must stop pretending that the degradation of our politics and the conduct of some in our executive branch are normal. They are not normal. Reckless, outrageous and undignified behavior has become excused and countenanced as telling it like it is when it is actually just reckless, outrageous and undignified.

And when such behavior emanates from the top of our government, it is something else. It is dangerous to a democracy. Such behavior does not project strength because our strength comes from our values. It instead projects a corruption of the spirit and weakness.

Mr. President, I rise today to say: enough. We must dedicate ourselves to making sure that the anomalous never becomes the normal.

Now, I’m aware that more politically savvy people than I will caution against such talk. I’m aware that there’s a segment of my party that believes that anything short of complete and unquestioning loyalty to a president who belongs to my party is unacceptable and suspect. If I have been critical, it is not because I relish criticizing the behavior of the president of the United States.

If I have been critical, it is because I believe it is my obligation to do so. And as a matter and duty of conscience, the notion that one should stay silent — and as the norms and values that keep America strong are undermined and as the alliances and agreements that ensure the stability of the entire world are routinely threatened by the level of thought that goes into 140 characters — the notion that we should say or do nothing in the face of such mercurial behavior is ahistoric and, I believe, profoundly misguided.

When a leader correctly identifies real hurt and insecurity in our country, and instead of addressing it, goes to look for someone to blame, there is perhaps nothing more devastating to a pluralistic society.

And so, Mr. President, I will not be complicit or silent. I’ve decided that I would be better able to represent the people of Arizona and to better serve my country and my conscience by freeing myself of the political consideration that consumed far too much bandwidth and would cause me to compromise far too many principles.

To that end, I’m announcing today that my service in the Senate will conclude at the end of my term in early January 2019. It is clear at this moment that a traditional conservative, who believes in limited government and free markets, who is devoted to free trade, who is pro-immigration, has a narrower and narrower path to nomination in the Republican Party, the party that has so long defined itself by its belief in those things.

This spell will eventually break. That is my belief. We will return to ourselves once more, and I say the sooner the better. Until that day comes, we must be unafraid to stand up and speak out as if our country depends on it, because it does. I plan to spend the remaining 14 months of my Senate term doing just that.