Sometimes one word is all you need.

Former President Barack Obama has been a silent bystander for much of the last three years. But on Saturday, he delivered a blistering critique of the Trump administration’s COVID-19 response, which he called an “absolute chaotic disaster.”

In the ensuing days, Donald Trump has been tweet-raging, pumping conspiracy theories and pushing for investigations into his predecessor. Trump and Fox News have teamed up to give it a name, Obamagate.

To all this nonsense, Barack Obama had a one word tweet that was on the one hand a retort, and on the other, advice.