President Jair Bolsonaro flexed his muscle on Brazilian Independence Day with huge rallies, but despite his attacks on the establishment and veiled threats of an eventual power grab, he looks increasingly isolated, analysts said Wednesday.

The far-right leader drew seas of supporters decked out in Brazilian green, yellow and blue into the streets of major cities across the country Tuesday, railing against a Supreme Court and electoral system supposedly stacked against him and vowing to defend his backers' "freedom."

Authorities placed turnout at an impressive 125,000 people at the biggest rally, in economic capital Sao Paulo -- though that fell short of Bolsonaro's vow to draw a crowd of more than two million.

It is also far from representative in this sprawling country of 213 million people, where Bolsonaro's popularity is at an all-time low of less than 25 percent, political analysts underlined.

Brazilian President Jair Bolsonaro enthralled his far-right supporters during huge rallies marking the country's independence day on September 7, 2021, even as he fought record-low poll numbers and a weakening economy
Brazilian President Jair Bolsonaro enthralled his far-right supporters during huge rallies marking the country's independence day on September 7, 2021, even as he fought record-low poll numbers and a weakening economy AFP / PAULO LOPES

The fired-up crowds, however, did make a mark on the national conversation, already consumed with the build-up to elections in October 2022 that polls put the embattled Bolsonaro on track to lose to leftist ex-president Luiz Inacio Lula da Silva.

"Despite his political isolation, the president showed he is still capable of mobilizing a noisy minority," political columnist Bernardo Mello Franco wrote in newspaper O Globo.

The high-risk national day came off relatively smoothly, despite fears the rallies could descend into a Brazilian version of the January 6 attack on the US Capitol by backers of former president Donald Trump, Bolsonaro's political role model.

Authorities reported few incidents, even as pro-Bolsonaro crowds of gun-rights advocates, evangelical Christians, anti-vax conspiracy theorists and motorcycle fanatics marched just miles (kilometers) from anti-Bolsonaro protests by leftist activists and labor movements.

However, analysts said Bolsonaro's new attacks on the Supreme Court and Superior Electoral Tribunal sound increasingly like a prelude to an eventual "power grab" if he loses next year's vote or refuses to take part in it.

Aerial view of a demonstration to support Brazilian President Jair Bolsonaro in Sao Paulo, Brazil, on the country's independence day September 7, 2021
Aerial view of a demonstration to support Brazilian President Jair Bolsonaro in Sao Paulo, Brazil, on the country's independence day September 7, 2021 AFP / Miguel SCHINCARIOL

"He practically declared war on the Supreme Court," said Edson Sardinha of the news site Congresso em Foco.

Bolsonaro, 66, notably warned he would no longer respect rulings by high court Justice Alexandre de Moraes, who has ordered the president investigated over accusations of systematically spreading fake news.

Chief Justice Luiz Fux said Wednesday that disrespecting a Supreme Court ruling would be an impeachable offense, and warned Bolsonaro: "No one will close this court."

Bolsonaro also renewed his attacks on Brazil's electronic voting system, which he alleges -- without evidence -- is plagued by fraud.

He said he refused to take part in an election "farce" in 2022.

Brazilian President Jair Bolsonaro, a former army captain, is openly nostalgic for the country's military dictatorship which lasted from 1964 to 1985
Brazilian President Jair Bolsonaro, a former army captain, is openly nostalgic for the country's military dictatorship which lasted from 1964 to 1985 AFP / Sergio Lima

"Bolsonaro constantly seeks to fuel crises. It's his style of governance, his means to rally his base," said Gaspard Estrada, a Latin America expert at Sciences Po in France.

Paradox abounded as Bolsonaro accused the Supreme Court of acting outside the constitution -- then appeared to do the same himself, insisting that "only God" could remove him from office.

"Bolsonaro isn't going to let go of power easily. With his power-grabbing behavior, he has shown he will go to any lengths -- including sowing chaos in Brazil -- to remain in the presidency," Estrada said.

Bolsonaro faces a series of investigations targeting him and his inner circle, including the fake news probe and a Senate inquiry into his controversial handling of Covid-19, which has claimed nearly 600,000 lives in Brazil.

With inflation and unemployment both surging, Tuesday's rallies only add to investor uncertainty over Latin America's economic giant, said Claudio Frischtak, president of consulting firm Inter.BConsultorio.

"It's very bad for the economy," he told TV Globo.

Bolsonaro, a former army captain, is openly nostalgic for Brazil's military dictatorship (1964-1985), and has hinted the armed forces could intervene against the other branches of government to give him unfettered power.

It is unclear the military would do that, however, despite hundreds of officers holding government posts in his administration, including at the highest levels.

"The president doesn't have the leverage to pull off a military intervention" against Congress or the Supreme Court, said political analyst Oliver Stuenkel of the Getulio Vargas Foundation.

The most likely scenario for the year ahead, he said, is "constant constitutional instability" and "a chaotic situation."