"What have you been doing?” Sen. Markwayne Mullin questioned Sanders during a tense back-and-forth. Sen. Bernie Sanders (I-Vt.) and Sen. Markwayne Mullin (R-Okla.) clashed Wednesday during a contentious discussion about the Affordable Care Act at a Senate hearing for President Trump’s surgeon general nominee, Casey Means. “When we start talking about health care not being affordable, the ranking member and I actually agree on that,” Mullin said, referring to Sanders, who chairs the Health,