Coronavirus: Trump authorizes plasma treatment amid attacks on FDA

• President blamed deep state or whoever' for slow progress
• Former FDA head hits back after chief of staff repeats claim

Donald Trump on Sunday announced the emergency authorization of convalescent plasma, a method which has been used to treat flu and measles, for Covid-19 patients.

The move comes after the US president expressed frustration at the slow pace of approval for coronavirus treatments, and caused controversy by publicly linking the Food and Drug Administration to the deep state" conspiracy theory.