Republican Sen. Jeff Flake again attacked President Donald Trump after announcing Tuesday he will not seek re-election.

Asked why he isn’t running for re-election the Arizona lawmaker said, “stay tuned,” and walked into the Senate Chambers. Flake is one of Trump’s most vocal critics.

“The flagrant disregard for truth and decency,” should never be regarded as normal, Flake said on the Senate floor minutes after his announcement. His voice shook. “Anger and resentment are not a governing philosophy.”

Flake said he plans to serve out the remainder of his term but will not contend in 2018.

Fellow Arizona Senator John McCain tweeted following Flake’s announcement: “Thank you to my dear friend @JeffFlake for your honorable service to the state of #Arizona the nation.”