WASHINGTON (AP) — Wisconsin Gov. Scott Walker says he is open to sending U.S. troops to the Middle East to combat Islamic State fighters, but the potential Republican contender for 2016 presidential nomination isn't calling for them immediately.

Walker told ABC's "This Week" on Sunday that he wouldn't rule out sending American forces abroad to confront threats to the United States or its allies. He also says President Barack Obama has not been aggressive enough in confronting threats from Islamic State fighters.

Walker, who is enjoying a burst of attention from the party's conservative base, this past week announced he is forming a political nonprofit to help him organize ahead of a likely White House run. He spent the weekend in Washington meeting with potential aides for and donors to a presidential campaign.