As the Biden administration and CDC take steps to bolster the US’s response to the spread of the Covid-19 variant and its knock-on effects, Vermont Senator Bernie Sanders is adding pressure to provide free high-grade masks to all Americans.

       In a tweet Monday, the senator shared a graphic headed “Not all masks are created equal”, which shows the different length of protection against transmission of Covid-19 provided by different masks. Below the table are the words: “We need N95 masks for all.”

       The senator’s intervention comes as the CDC is reportedly weighing whether to recommend all Americans who can start wearing N95 and KN95 masks, both of which provide substantially more protection than the cloth or thin disposable masks worn by most people in day-to-day life.

       Recommended KN95 and N95 masks: Which does the CDC recommend, and can you reuse them? ‘You’re playing with dynamite’: Experts warn people to stop deliberately getting Covid to ‘get it over with’ Record number of Americans are now hospitalised with Covid

       The Biden administration has also been under heavy pressure to improve the provision of free over-the-counter self-testing kits, which have proven both hard to obtain and expensive as the Omicron variant spreads fast.

       While much of early 2020 saw the Trump administration struggle to organise a reliable supply of protective equipment just for healthcare workers, Mr Sanders has long been an advocate of providing free protective masks to the population at large.

       In July 2020, he introduced a bill with multiple Democratic cosponsors that would have seen masks delivered by the US Postal Service around the country and made available to vulnerable populations including care home residents and unhoused people.

       “What we want to do,” the senator said at the time, “is say to the American people that masks are important and that we will provide every person in this country with three reusable masks, the highest quality that we can.

       “And I think by doing that, by getting masks out to every household in the country, it sends the message, which Trump should have sent many months ago, that wearing a mask is very, very important.”

       The Senate was controlled by the Republican Party at the time, and the legislation did not pass.