Republican House majority to shrink as Mike Gallagher steps down

Congressman once considered a rising Republican star to leave in April, further weakening party's slim majority

The Republican majority in the US House of Representatives is set to dwindle further with the early exit of Mike Gallagher of Wisconsin, once a rising star of the party.

A former US marine who twice deployed to Iraq, Gallagher, 40, is a relatively moderate voice in party at the mercy of the far right.