Republican members were being repeatedly asked about the Trump investigation. Like Trump, they can now defer to Mueller’s probe. This will make them very happy. And in the long run, Mueller helps them avoid the awkward circumstance of investigating their own president. A damning report will make it easier to call for Trump’s resignation, if strong evidence emerges. Alternatively, a report that absolves Trump could take the Russia issue off the table without Republicans looking like they’d engaged in a partisan cover-up.
More importantly, Republicans now have more room to get back to their policy goals, such as tax reform and Obamacare repeal. Mueller’s investigation is likely to take months. While that unfolds, Trump can sign into law bills passed by Republicans in the House and the Senate.