Ever since Donald Trump announced his candidacy for president, he's been criticized for his controversial campaign style and his shady business history. With just 40 days until Election Day, it appears that an October surprise is ready to hit the Trump campaign earlier than expected.

Trump's Cuban link

Of all the allegations against him, Trump's alleged "bromance" with Russian President Vladimir Putin is one of the most controversial. Putin is known to be a quick trigger that many in the West distance themselves from, though it hasn't pushed Trump away from offering praise.

Despite this, Trump has embraced Putin at times, raising questions about his motivation. While being linked to Putin has caused issues for the billionaire real estate mogul, it's his alleged ties to Cuba and Fidel Castro that could cause campaign-ending panic, as reported by Newsweek, and highlighted on the September 28 edition of "The Rachel Maddow Show."

In a partial transcript of the "Newsweek" story set to be released Thursday morning, one of Trump's private companies "secretly conducted business in communist Cuba during Fidel Castro's time as leader." The allegations against Trump show that he violated the Cuban Embargo, which banned American trade to the country.

Newsweek's investigation came to their conclusion after in-depth interviews with former Trump executives, as well as legal court records.

In too deep

The report found that Trump's company spent no less than 68,000 during it's dealing with Cuba, which reportedly took place in 1998.

At the time, it was illegal for corporations to spend money in the country without approval from the government, but Trump found away around the law. Allegedly, high-profiled executives would send the money through "Seven Arrows Investment and Development Corporation," a United States consulting firm, with strict instructions to make the finances legal by "linking it after-the-fact to a charitable effort."

The article also points out the timing of incident, which took place just months before Trump launched his first presidential campaign in 2000, as a member of the Reform Party.

Trump spoke to potential Cuban-American voters in Miami and was critical of Castro and Cuba, never mentioning his financial dealings earlier in the year.

Election impact

It's unknown whether or not the bombshell story by Newsweek will have a major impact on the former host of "The Apprentice, who's found a way to weather the storm time and time again during the campaign. According to the latest round of polling, Trump is trailing Hillary Clinton by three points, but has pulled ahead in Ohio and Florida. With Trump struggling to gain traction with minority voters, most pollsters believe the former Secretary of State will become the next President of the United States.