Republicans won't support a simple fix to Obamacare should the Supreme Court strike its subsidies, Rep. Paul Ryan said Sunday.

"We're not going to do that," Ryan, R-Wis., told Fox News' Chris Wallace. "I think everyone knows we're not going to do that."

The looming question of how Republicans will respond if the court upholds the King v. Burwell challenge, rendering illegal the federal subsidies that make health insurance affordable for some 7 million Americans, remained unanswered by Ryan.

Ryan insisted his party won't agree to keep the subsidies flowing without also making other big changes to the law — likely making it a non-starter for President Obama, who doesn't want to dismantle his signature legislative achievement.

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