WASHINGTON Time was running brief for President Donald Trump to attract enough votes to cross a brand new bill to overtake the U.S. healthcare system this week as Republican celebration moderates held out, fearing a backlash from voters anxious about dropping insurance benefits.

Pence and White House Chief of Staff Reince Priebus laid out the administration’s revised healthcare plan during a 40-minute meeting with Freedom Caucus members, said Congressman Mark Meadows, the chief of the conservative group. Notice how giant the Blackfeet reservation is, covering all the area within the darker beige shade east of Glacier National Park on the accompanying map. Several insurers, including Aetna (AET.N) and Humana (HUM.N), have largely left the Obamacare exchanges, citing a pool of patients who are sicker than expected and therefore more expensive. Insurers have also repeatedly called on the Trump administration to fund the fee-sharing subsidies.

John A. Bardis, founder of MedAssets, …