House Republicans announced a spending bill to keep government agencies open through Sept. 30, daring Democrats to vote against it and risk a disruptive March 15 shutdown.

A mystifying recent ritual of American politics is set to commence again this week as lawmakers play chicken with a government shutdown that could begin Friday night if gridlock wins out. It's perhaps even more bewildering for markets and pretty much everyone else given the Republicans' unified control of government at the moment.

Trump says a government shutdown 'could happen' if the House fails to pass a six-month stopgap funding bill. More Videos