By Jonathan Davies

McDonald's has dashed the dreams of fast food lovers everywhere by rejecting Burger King's request to team up for Peace Day and create the 'McWhopper'.

Burger King yesterday (Wednesday) launched the McWhopper campaign, encouraging the two fast food giants to team up and combine the best parts of the Big Mac and Whopper.

But in a Facebook post, McDonald's said the rivals could do "something bigger".

Burger King wanted to open a pop-up restaurant in Atlanta, half way between McDonald's Chicago HQ and its own Miami HQ, with co-branded packaging and uniforms.

In the Facebook post, McDonald's chief executive Steve Easterbrook, said: "Inspiration for a good cause... great idea.

"We love the intention but think our two brands could do something bigger to make a difference.

"We commit to raise awareness worldwide, perhaps you’ll join us in a meaningful global effort?

"And every day, let's acknowledge that between us there is simply a friendly business competition and certainly not the unequaled circumstances of the real pain and suffering of war.

"We’ll be in touch.

"P.S. A simple phone call will do next time."