Sign-ups for Affordable Care Act health plans are more than 45 percent ahead of last year's pace.
The numbers from the Centers for Medicare and Medicaid Services come as Republican senators are pushing to pay for tax cuts by repealing the "Obamacare" requirement to carry coverage.
The new figures show that nearly 1.5 million consumers picked a plan through Nov. 11, compared to just over 1 million from Nov. 1-12 last year. The share of new customers for 2018 coverage stayed at about 23 percent.
The data cover 39 states served by the HealthCare.gov website. The overall number of sign-ups is higher because states running their own health insurance markets are not included in the government data.