Pro-Brexit protesters in London last month. : Bipartisan negotiations to forge a border security deal broke down yesterday, potentially setting up the federal government for another shutdown ahead of a Friday deadline. What happened? “The impasse appears to center on Democratic demands for a limit on the number of unauthorized immigrants already in the country who could be detained by Immigration and Customs Enforcement officers, according to aides familiar with the talks,” according to the NYT. Republicans wanted an exception to the cap for criminals; Democrats said a proposed 16,500-bed cap left more than enough room for them.