States will receive about 14.5 million doses of the coronavirus vaccine this week, marking a nearly 70% increase in distribution of doses over the last month, White House press secretary Jen Psaki said Tuesday.

Limited supply of the two approved COVID-19 vaccines has hampered the pace of vaccinations — and that was before extreme winter weather delayed the delivery of about 6 million doses this past week.

The number of doses states will receive will increase from the 8.6 million a week they received during President Joe Biden’s first week in office. Last week, the White House announced that states would receive 13.5 million doses of the vaccine.

The White House announced last week that it’s in the process of doubling to 2 million the number of doses sent directly to pharmacies. Psaki also noted White House coronavirus coordinator Jeff Zients told governors on Tuesday that pharmacies will see an increase in allocation by about 100,000 doses this week.

Biden has said that every American who wants a vaccination can get one by the end of July.

Meanwhile, the top developers of U.S. COVID-19 vaccines are facing questions from Congress about limited supplies of the shots needed to end the pandemic.

The pace of vaccinations is picking up nationwide, but demand for the shots continues to outpace limited supplies distributed by the U.S. government. The Energy and Commerce Committee panel began hearing testimony from the five companies with contracts to supply COVID-19 shots to the U.S. — Pfizer, Moderna, Johnson & Johnson, AstraZeneca and Novavax.

Johnson & Johnson revealed ahead of the hearing that initial supplies of its one-shot vaccine will be limited to 20 million doses by the end of March. The company plans to tell lawmakers it faces “significant challenges” in scaling up production.

However, federal health officials say a total of 700 million doses is still slated for delivery by late July. That would be enough to reach the goal of providing enough shots for every American adult.

The pandemic has killed more than 500,000 Americans.