Everyone's heard about Donald Trump's threat to ban Muslims from entering the United States if he is elected president.

Announced in December, his extreme plan for a "a total and complete shutdown" of Muslim immigration shocked many - but one Middle Eastern airline was inspired to create a tounge-in-cheek advertisement in response.

In December, Donald Trump called for
In December, Donald Trump called for "a total and complete shutdown" of Muslim immigration to the US. Photo / AP

Shared on Twitter on the day of the presidential election, Royal Jordanian airline's ad reads: "Just in case he wins ... Travel to the US while you're still allowed to!"

The advertisement has since gone viral on Twitter, accumulating over 2000 likes and over 1400 retweets since it was posted nine hours ago.

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The campaign was well received, with some commenting that the airline should win an award for its topical tagline.

- nzherald.co.nz