He makes a mountain out of a molehill.

If I'm in the wrong, I want to make it right... but you're making a mountain out of something that isn't even an anthill... let alone a molehill.

But appearances proved to be deceptive. A minor problem (at least in scale) like Cyprus, when combined with an almost unbelievable degree of incompetence among the troika (the European Commission, the European Central Bank, and the International Monetary Fund), was enough to turn a molehill into a mountainous crisis.