Veteran journalist Dan Rather says all Americans must hold President-elect Donald Trump accountable.

“Now is a time when none of us can afford to remain seated or silent. We must all stand up to be counted,” Rather wrote in a Facebook post Tuesday.

{mosads}“History will demand to know which side you were on. This is not a question of politics or party or even policy. This is a question about the very fundamentals of our beautiful experiment in a pluralistic democracy ruled by law.”

Rather said he is speaking out because of white nationalists celebrating Trump’s White House win.

“When I see neo-Nazis raise their hands in terrifying solute [sic], in public, in our nation’s capital, I shudder in horror,” he said, referencing an alt-right conference in Washington on Saturday.

“When I see that action mildly rebuked by a boilerplate statement from the president-elect whom those bigots have praised, the anger in me grows. And when I see some in a pliant press turn that mild statement into what they call a denunciation, I cannot hold back any longer.”

Rather also slammed Trump’s administration appointments, saying they suggest he will not condemn intolerance from supporters.

“This is not about tax policy, healthcare or education — even though all of those and more are so important,” he said. “This is about racism, bigotry, intimidation and the specter of corruption.

“I hope that the president-elect can learn to rise about this and see the dangers brewing. If he does and speaks forcibly, and with action, we should be ready to welcome his voice. But of course I am deeply worried that his selections of advisors and Cabinet posts suggests otherwise.”

Supporters of the alt-right movement celebrated Trump’s White House win in Washington on Saturday, with some using Nazi gestures and phrases.

Trump on Tuesday condemned the event, saying he does not want to “energize” the alt-right.

Critics say the alt-right is an ideology that embraces white nationalism, anti-Semitism and misogyny.