molehill

In both cases, the minority party on both committees thinks the majority is making a mountain out of a molehill.

But is this merely a case of making a mountain out of a molehill—or is there a legitimate reason to be upset?

Few diplomatic events are more embarrassing than a summit that turns into a molehill.

As regards his being over London, you've got to make a molehill out of that mountain, if it is a mountain.