Jermaine Jackson, former Jackson 5 member and brother of late pop star Michael Jackson, tore into Donald Trump Friday for comments the billionaire mogul made about the decline of his brother's career.

"'Friends' don't pay tribute by peddling b.s. theories about Michael's 'loss in confidence'. This fool Trump needs to sit down," he tweeted.

Jermaine was referring to Trump's CNN town hall appearance in South Carolina Thursday night, where he told moderator Anderson Cooper that he and Michael were "very good friends" and claimed Michael "lost tremendous confidence because of honestly bad, bad, bad surgery."

According to ABC News, Jackson reportedly rented an apartment in Trump Tower, which he used to honeymoon with Lisa Marie Presley, the daughter of Elvis Presley, after their wedding in 1994.

Jermaine continued bashing the GOP presidential candidate: "Michael's confidence was affected by the pressures, injustice and vitriol of external circumstances. Period."

Michael died in 2009 of cardiac arrest caused by a drug overdose.

His brother ended his Twitter rant with one last Trump zinger: "Name-dropping Michael don't make you cool and won't win you votes. Especially when using botched facts."

A few hours later, Jermaine also clarified his comments to TMZ via Twitter.

".@TMZ, I never said 'You're no friend of Michael.' He was. It's 'botched surgery' talk that I don't expect from a friend," he wrote.