President Joe Biden is widening a critical window for low-income Americans to join Obamacare, in a move aimed at reinforcing a central element of his reelection bid: That he presided over a historic expansion of health care coverage.

Tens of millions of people eliminated from Medicaid would now have until Nov. 30 to sign up for new coverage under a plan to be announced Thursday by the Department of Health and Human Services and first shared with POLITICO — an extension from the July 31 deadline initially set for the special enrollment period.

The new timeline will apply to all those seeking coverage through HealthCare.gov, with officials encouraging state-run insurance marketplaces to adopt the change as well.

The move aims to minimize the number of people losing health insurance coverage in the run-up to the November election as a result of a nationwide purge of state Medicaid rolls. The mass disenrollments are happening for the first time since the pandemic, prompted by the expiration last April of a Covid-era policy meant to prevent vulnerable people from losing coverage amid the health crisis.