WASHINGTON — President Donald Trump singled out Brazil for import taxes of 50% on Wednesday for its treatment of its former president, Jair Bolsonaro, showing that personal grudges rather than simple economics were driving the U.S. leader’s use of import taxes.

Trump avoided his standard form letter with Brazil, specifically tying his tariffs to the trial of Bolsonaro, who is charged with trying to overturn his 2022 election loss. Trump has described Bolsonaro as a friend and hosted the former Brazilian president at his Mar-a-Lago resort when both were in power in 2020.

“This Trial should not be taking place,” Trump wrote in the letter posted on Truth Social. “It is a Witch Hunt that should end IMMEDIATELY!”

Trump also objected to Brazil’s Supreme Court fining of social media companies such as X, saying the temporary blocking last year amounted to “SECRET and UNLAWFUL Censorship Orders.” Trump said he is launching an investigation as a result under Section 301 of the Trade Act of 1974, which applies to companies with trade practices that are deemed unfair to U.S. companies.

The Brazil letter was a reminder that politics and personal relations with Trump matter just as much as any economic fundamentals.

Trump also sent letters Wednesday to the leaders of seven other nations. None of them — the Philippines, Brunei, Moldova, Algeria, Libya, Iraq and Sri Lanka — is a major industrial rival to the United States.

Trump, during a White House meeting with African leaders, talked up trade as a diplomatic tool. Trade, he said, “seems to be a foundation” for him to settle disputes between India and Pakistan, as well as Kosovo and Serbia.

“You guys are going to fight, we’re not going to trade,” Trump said. “And we seem to be quite successful in doing that.”

On Monday, Trump placed a 35% tariff on Serbia, one of the countries he was using as an example of how fostering trade can lead to peace.

Trump said the tariff rates in his letters were based on “common sense” and trade imbalances, even though the Brazil letter indicated otherwise. Trump suggested he had not thought of penalizing the countries whose leaders were meeting with him in the Oval Office — Liberia, Senegal, Gabon, Mauritania and Guinea-Bissau — as “these are friends of mine now.”