If the fork is visibly bent - i.e., damaged - and you bought the bike new, return it to the store for a new one.
If the fork blades seem to be only around a centimeter too close together, look closely at the fork ends and the wheel axle. To ensure that the wheel will stay in place in the fork even if the axle nuts come loose, some fork end/axle combinations are designed to require the ends to be spread apart a small amount before the exle nuts can fit into corresponding cutouts or depressions in the fork ends.