Last year, Bolsonaro promised to make Brazil leave the Paris Climate Agreement - something that Trump already did - as well as slammed the local press for spreading "fake news" in another striking parallel to the U.S. leader while promising that his government "would not be politically correct." .
Bolsonaro faces trial before the Supreme Court for speech that prosecutors said incited hate and rape. Such measures are rare for candidates in Brazil. The man was arrested in 2013 for another assault, police said. He has called the charges politically motivated.
Like Trump, Bolsonaro portrayed himself as a pro-gun anti-establishment candidate, who seeks to "drain the swamp" of the Brazilian elite, which has sunk in corruption.Some Brazilian media also reported that Bolsonaro repeatedly spoke favorably of Trump and even liked to compare himself to the USA president.
Demonstrators react next to a drawing of Rio de Janeiro city councillor Marielle Franco, who was shot dead earlier this year. It said the circumstances were being investigated.
Local police in Juiz de Fora confirmed to Reuters that a suspect was in custody, but they did not identify him.
Oliveira was a member of the Socialism and Liberty Party from 2007 to 2014, Brazil's Veja magazine reported. "Voters may be awakened to the thought that politicians who propose loosening gun laws, for example, end up giving unbridled power to insane people, like the man who carried out the attack yesterday". "In this hard moment that our country is going through, we must rigorously safeguard human life and the defense of our institutions and democratic life", she said.
Adelio Bispo de Oliveira, the suspected attacker of Jair Bolsonaro. Vitor Albuquerque, a spokesperson for the local police.
Video shared on social media showed a knife appearing from the crowd and striking Bolsonaro in his stomach.
Bolsonaro screamed in pain after being stabbed in his abdomen, then fell backward into the arms of those around him.
A few people gathered outside the hospital where Bolsonaro was treated Thursday night where the scene was calm.
Meanwhile, on Twitter many decried the stabbing and asked for prayers for Bolsonaro, but others suggested the candidate might have brought the attack upon himself or even staged it.
Bolsonaro's rivals in the race expressed outrage at the attack. Former Environment Minister Marina Silva and left-wing candidate Ciro Gomes each have 12 percent while former governor of Sao Paulo, Geraldo Alckmin, has 9 percent.
Fernando Haddad, who is expected to replace Lula for the Workers" Party, said that the attack was "absurd and regrettable" and President Michel Temer said that it was "intolerable' in a democratic state such as Brazil.