Donald Trump Jr. retweeted a conspiracy theory Thursday that linked Bill Clinton's firing of his FBI director to the suicide of the former president's top aide Vince Foster.

"President Clinton fired his FBI director on July 19th, 1993, The Day before Vince Foster was found dead in Marcy Park," Twitter user @StockMonsterUSA wrote.

Trump's oldest son shared the tweet as the president faces intense scrutiny over his firing of FBI Director James Comey amid the bureau's investigation into possible collusion between the Trump campaign and Russia.

He unshared the tweet after reports were published about his promotion of the conspiracy theory. But as of 12:30 p.m. Thursday, Trump Jr. had still liked the tweet.

Several official investigations into Foster's death concluded he committed suicide in 1993 as he suffered from depression. Far-right conspiracy theories linked the Clintons to Foster's death.

In an interview with the Washington Post a year ago, the president said he has doubts about the official version of events surrounding Foster's death.

"He had intimate knowledge of what was going on," Trump said of Foster's relationship with the Clintons. "He knew everything that was going on and then all of a sudden he committed suicide."