• Far-right demonstrations called for 15 March
• Former president: ‘We must shout while we still have a voice’

Jair Bolsonaro’s apparent endorsement of protests designed to cow Brazil’s democratic institutions has sparked outrage across the political spectrum with one lawmaker warning of a return to the dark days of dictatorship if the demonstrations are not opposed.

Hardcore supporters of Brazil’s far-right president are planning nationwide protests on 15 March and have been flooding social media with propaganda videos and fliers attacking members of Congress – and even proposing a return to military rule under Bolsonaro.

Some suspect Adriano da Nóbrega was ‘key piece’ in discovering who ordered Franco’s killing

Friends and relatives of the murdered Brazilian politician Marielle Franco are demanding answers after Adriano da Nóbrega – a notorious hitman, whose gang of contract killers is suspected of involvement in her assassination – was gunned down by police in the north-east of the country.

Nóbrega, an ex-special forces police captain, also had close links to the family of the far-right president, Jair Bolsonaro. Nóbrega was killed by police on Sunday in Bahia state where he had been on the run.

Six prominent voices from the arts, media, diplomacy and the Amazon give their views on the far-right president’s opening 12 months

It has been a year since a pro-gun, anti-indigenous far-right former army captain took power in Brazil and began sending shockwaves through the country’s government and society.

In those 12 months, Jair Bolsonaro – who is openly homophobic and allied to Brazil’s hardline religious right – has declared war on film-makers, journalists and the environment; put a conspiracy theorist in charge of the foreign service; and greenlit a new era of police repression and rainforest destruction.

President’s office said Bolsonaro spent the night in the hospital and was discharged on Tuesday

The Brazilian president, Jair Bolsonaro, said on Tuesday night that he briefly lost his memory after falling at his presidential residence in Brasilia, the capital, earlier this week.

The president’s office disclosed on Monday that Bolsonaro, 64, had suffered a fall and was taken to a hospital Monday night for a brain scan, which detected no abnormalities. Bolsonaro spent the night in the hospital and was discharged on Tuesday.

Critics interpret president’s attack on journalist as attempt to divert attention from spiralling scandal involving son Flávio

Brazil’s far-right president, Jair Bolsonaro, has launched a homophobic attack on a journalist from one of the country’s top newspapers in an apparent bid to divert attention from a spiraling corruption scandal involving his son.

Related: Murder of Uber drivers may be Brazil gang leader’s ‘revenge’ for cancelled ride

Investigators examining Bolsonaro’s senator son Flávio, suspected of overseeing corruption racket during tenure as Rio congressman

Investigators have raided the home of a longstanding friend and associate of the Brazilian president Jair Bolsonaro, as well as addresses linked to Bolsonaro’s ex-wife, in the latest phase of a politically damaging corruption investigation embroiling his family.

Related: Brazil has become a cautionary tale for the world's democracies | Petra Costa