On Sunday's show, we'll have new details about the record temperatures this week. and we'll discuss what they mean for the politics of global warming. We'll also examine the political fallout from the Supreme Court's ruling on the Affordable Care Act, and the electoral impact of reports that Mitt Romney's former firm, Bain Capital, invested in companies that moved jobs overseas.

Joining Chris at 8 AM ET on MSNBC will be:

Bill McKibben (@billmckibben), author of "Eaarth: Making a Life on a Tough New Planet" and founder of 350.org, a global grassroots environmental movement to solve the climate crisis.

Eric Klinenberg (@EricKlinenberg), professor of sociology at New York University and author of “Heat Wave: A Social Autopsy of Disaster in Chicago.”

Thomas Mann and Norman Ornstein, authors of "It's Even Worse Than It Looks: How the American Constitutional System Collided with the New Politics of Extremism." Mann is senior fellow for governance studies and the W. Averell Harriman Chair at the Brookings Institution. Ornstein is a resident scholar at the American Enterprise Institute.

Joan Walsh (@joanwalsh), MSNBC political analyst and Salon's editor-at-large.

Esther Armah (@estherarmah), playwright and author, host of "Wake Up Call" on WBAI-FM.

Stephen Moore, Wall Street Journal editorial board senior economics writer, and the former president of the Club for Growth.