OPINION: Replacing Obamacare Is Still a Republican Duty

President Trump has tasked three Republican senators with coming up with a replacement for Obamacare if courts strike it down. It’s a prudent contingency plan. Republicans should, for that matter, advance their own health-care plan even if the lawsuit fails — as it is highly likely to do, in part because it lacks legal merit.

Republican senators are not notably eager to take up this assignment; their leader Mitch McConnell has suggested that the Senate will wait for the White House and the Democrats to reach a deal before it...