Explainer: How U.S. shutdown over border wall fight might play out

Trump has refused to sign any legislation to fund an array of government agencies, including the departments of agriculture, commerce, justice, interior and homeland security, unless it includes $5.7 billion for his long-promised wall.The Democrats, who control the House of Representatives, have rejected the wall as ineffective and immoral, and want the government to be reopened before any further talks about border security.