Politically freighted border security negotiations are teetering just days before a potential new government shutdown. The turmoil is testing the changed balance of power in Washington, with lawmakers engaged in a sparring match over immigration policy that is challenging their ability to reach any accord.

Republicans say Democratic demands to limit immigrant detentions by federal authorities are a deal breaker — eclipsing the border wall issue for now — and represent overreach by top Democrats like House Speaker Nancy Pelosi of California.

Read more at Associated Press News.