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John Miller, Associated Press
U.S. Rep. Raul Labrador, R-Idaho, speaks during an interview at Associated Press offices in Boise on Wednesday, Sept. 4, 2013. Though he's not closing out the possibility of changing his mind, Labrador said he's leaning strongly against opposing a U.S. military strike against Syria, on grounds that President Obama and Secretary of State John Kerry have failed to make the case that U.S. national security interests are otherwise in jeopardy.

BOISE, Idaho — Lawmakers are returning to the nation's capital after a five-week break and have unfinished business on immigration.

But Idaho Republican Rep. Raul Labrador has expressed an increasing skepticism that any changes will pass this year, saying wide political differences and more pressing issues, such as Syria and the national debt, will prevent progress.

Immigration has had a prominent place this year in the national conversation as Congress, prompted by President Barack Obama, has debated making changes to the nation's laws. The topic was expected to come up again at some point after lawmakers reconvene Monday in Washington, D.C.

But Labrador said any discussions on the topic will likely have to wait until late fall.