Shut down gov't. to defund Obamacare? Some in GOP think so05:45
Politico Playbook: "A growing number of Republicans are rejecting calls from leading conservatives, including Sens. Marco Rubio, Ted Cruz and Rand Paul, to defund the president's health care law in the resolution to keep the government running past Sept. 30," write Politico's Manu Raju and Jake Sherman. John Harris joins Morning Joe to discuss.