Nation and World News By Associated Press | Monday, February 11, 2019, 12:05 a.m. Share this story As clock ticks, new hurdle emerges in border security talks WASHINGTON — Bargainers clashed Sunday over whether to limit the number of migrants authorities can detain, tossing 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. ADVERTISING 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. But rising to the fore was a related dispute over curbing Customs and Immigration Enforcement, or ICE. Acting White House chief of staff Mick Mulvaney, in appearances on NBC’s “Meet the Press” and “Fox News Sunday,” said “you absolutely cannot” eliminate the possibility of another shutdown if a deal is not reached over the wall and other border matters. The White House had asked for $5.7 billion, a figure rejected by the Democratic-controlled House of Representatives, and the mood among bargainers has soured, according to people familiar with the negotiations not authorized to speak publicly about…