''I'm not confident we're going to get there," Alabama U.S. Senator Richard Shelby told reporters today, Bargainers clashed Sunday over whether to limit the number of migrants authorities can detain. This apparently tosses a new hurdle before negotiators hoping to strike a border security compromise for Congress to pass this coming week. The White House wouldn't rule out a renewed partial government shutdown if an agreement isn't reached. With the Friday deadline approaching, the two sides remained separated by hundreds of millions of dollars over how much to spend to construct President Donald Trump's promised border wall. Both sides are eager to resolve the long-running battle and avert a fresh closure of dozens of federal agencies that would begin next weekend if Congress doesn't act by Friday.