"Oh no, our movie is totally different from theirs," he says, straight-faced. "Theirs is a hard R and ours is PG."
Nevertheless, the comparisons must have been frustrating, especially given that Olympus was the first movie out of the gate. He sighs. "When I started my movie I was not aware of Olympus and all of a sudden they had a director and started shooting five weeks after us. So, yes, I was not happy about it, but what can you do? I thought, 'Why couldn't the studios just talk to each other so that wouldn't have happened?"'
White House Down borrows heavily from the Die Hard franchise. The formula relies on an against-the-odds premise when an ordinary ex-cop, or in this case, ex-security guard, is able to take down a team of professional assassins while being enough of a multi-tasker to deliver wisecracks in the face of extreme danger.
The question remains, is the White House really that vulnerable?
Emmerich, who's clearly given the matter much thought, says, "Well, in real life, I would say that they have a security problem because it's a relatively old house, and it's surrounded by higher buildings. But the reason I like using the White House in movies is because everyone knows it. I think it's the most famous house in the world and it's the centre of the Western superpower."
Emmerich is a fan of the current resident of the place.
"He stood up for the gay population, so he's a bit of a hero to me. He's also inspirational and he can hold a speech."
The openly gay director has some interesting ideas on how to push the envelope in future action movies.
"In the same way that when a black man plays a character and the fact he's black isn't an issue, one day there will be a gay action hero, and it won't be important that he's gay," he says. "When that day comes, it will make a difference."
Perhaps if he ever makes Independence Day 2, he could cast a gay president? He considers. "Yes, or maybe the aliens could be gay."
Who: Roland Emmerich, director
What: White House Down
When: Opens today
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- TimeOut