Pfizer-BioNTech is expected to seek authorization from the Biden administration to begin supplying booster shots of its COVID-19 vaccine for Americans 18 and older. This petition may arrive as soon as this week.

On Monday, it was reported that Pfizer is preparing to seek an Emergency Use Authorization from the Food and Drug Administration (FDA) for the booster, according to a Biden administration official who spoke to CNN. The news of the EUA request was first reported by the Washington Post on the same day.

Pfizer was the first booster to receive authorization from the FDA with limitations on who is eligible to receive it and how soon. Currently, it is available for Americans aged 65 and older, employees who work in environments where exposure to COVID-19 is considered high, and others with risk factors for severe infection.

If approved, additional booster shots for Americans would bolster President Joe Biden’s previous promises to make them more widely available. Ahead of its booster campaign in September, the Biden administration was divided over how extensive a booster campaign would be.

Several public health officials resigned amidst disagreements with the White House, but the administration ultimately launched its booster campaign on Sept. 20. Only the Pfizer vaccine, which is 95.6% affective against severe infection, was available at the time, raising concerns about capacity and supply.

Pfizer has not yet confirmed that it will be seeking an EUA, but this news follows Friday’’s announcement that it was seeking FDA approval for an anti-viral pill to treat COVID-19. The company insists that its data show that the pill can cut COVID-19 hospitalizations down by up to 89%.

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