Brazil's Supreme Court blocked Argentine President Javier Milei from visiting former President Jair Bolsonaro under house arrest — then suspended all visits to Bolsonaro for 30 days after his son shared a letter from his father endorsing the son's presidential campaign.

When a single justice decides which foreign heads of state can see a detainee, which words a son can share from his father, and bans all visits with "political-electoral finality" through an election cycle, the court isn't just enforcing a sentence. It's managing who gets to participate in politics.

Justice Alexandre de Moraes rejected the Milei visit request late Friday, citing a standing bar on visits of a "political-electoral nature," the Associated Press reported. The meeting had been set for July 25 in Brasilia. Moraes then went further. Reuters reported that he suspended all visits to Bolsonaro for 30 days — permitting only medical care and lawyers — after Senator Flávio Bolsonaro, the ex-president's son and a presidential candidate, shared a letter from his father on social media. The letter urged supporters to "set aside any differences, and have everyone commit to supporting" Flávio's October run against incumbent Luiz Inácio Lula da Silva.

Bolsonaro's house arrest conditions already barred him from using social media or phones "directly or through third parties," Reuters reported. Moraes ruled that Flávio posting the letter violated those terms. He barred the senator from visiting his father for 90 days and banned all visits with "a political-electoral finality" until the elections conclude. Flávio Bolsonaro called the ruling an "attempt to interfere in the elections."

This isn't Moraes' first time as gatekeeper. In March, he denied a visit request from Darren Beattie, a conservative author turned Trump administration undersecretary, the AP reported. The court is systematically cutting Bolsonaro off from conservative allies abroad and political allies at home — while his son campaigns to unseat Lula, the same man Bolsonaro lost to in 2022.

Bolsonaro was sentenced last year to more than 27 years for plotting a coup after losing the 2022 election, Reuters reported. He was moved to house arrest this year on health grounds. The AP notes that Lula and Milei have a "frosty relationship," with Lula historically aligned with Milei's adversaries.

The New York Times, meanwhile, covered a parallel case up north: Freedom Convoy organizer Tamara Lich, under house arrest in Canada, is asking a court to let her travel to the U.S. — including a White House visit. Prosecutors are fighting it, calling the request a bid for "self promotion." The Times framed the story around Ottawa residents' grievances from the 2022 protest; the judicial question of political isolation received no scrutiny.

Bolsonaro's son campaigns against Lula this October. Moraes has given himself the authority to decide what counts as political, who counts as a permissible visitor, and which family communications cross the line. The court says it's enforcing the law. The effect is a political rival muzzled and isolated through an election his own son is fighting to win.