The Supreme Court’s landmark healthcare ruling will pose a big test for Republicans, even if the court strikes down all or part of President Obama’s healthcare law.

So far, the party has not come together around a set of policies to replace the healthcare law if it’s struck down entirely. Republicans also haven’t said how they would handle policies that are already in place, including discounts on prescription drugs for many seniors.

House Republicans will proceed with a rational, positive transition so that any disruption that’s created by the court decision is mitigated,” said Rep. Tom Price (R-Ga.), who chairs the Republican Policy Committee.

The court is expected to decide this month whether the law’s mandate that individuals buy insurance is constitutional — and, if not, whether to throw out the entire law, or only part of it.