CNN 'Believer' host Reza Aslan calls Trump 'embarrassment to humankind' over London tweet

UPDATE: Aslan has taken down the tweet and issued the following apology:

ORIGINAL STORY: The host of a CNN documentary series about spirituality is making headlines over his heated reaction to President Donald Trump's response to Saturday's deadly terrorist attacks in London.

Religious scholar Reza Aslan, host of "Believer," took to social media after Trump tweeted following the London attacks in support of his controversial travel ban targeting Muslim-majority nations.

"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!" Trump wrote Saturday evening before posting a separate tweet expressing solidarity with and offering help to the United Kingdom.

Aslan, who is Muslim, tweeted in response to Trump's first message: "This piece of [expletive] is not just an embarrassment to America and a stain on the presidency. He's an embarrassment to humankind."