After the latest suspected Islamic terrorist attack in London on Saturday, a CNN host lashed out at President Trump over his renewed call for a travel ban.

The president took to Twitter Saturday evening, saying, “We need to be smart, vigilant and tough. We need the courts to give us back our rights. We need the Travel Ban as an extra level of safety!”

We need to be smart, vigilant and tough. We need the courts to give us back our rights. We need the Travel Ban as an extra level of safety! — Donald J. Trump (@realDonaldTrump) June 3, 2017

That triggered CNN host Reza Aslan, who lashed out, writing, “This piece of shit is not just an embarrassment to American and a stain on the presidency. He’s an embarrassment to humankind.”

This piece of shit is not just an embarrassment to America and a stain on the presidency. He's an embarrassment to humankind. https://t.co/Dl5tMQMhMO — Reza Aslan (@rezaaslan) June 3, 2017

Aslan hosts a show called “Believer with Reza Aslan” on the network in which he “immerses himself in the world’s most fascinating faith-based groups to experience life as a true believer,” according to the show’s website.

UPDATE: The CNN star deleted his tweet, but you can see it here: