The special counsel investigation into ties between Trump campaign officials and Russia has expanded to include President Trump's business transactions and those of his associates, according to a report.

Investigators with the FBI as well as others part of special counsel Robert Mueller's probe are examining apartment purchases from Russians in Trump-owned buildings. They're also looking into the president's previous involvement in a SoHo hotel condominium development with Russian associates, the Miss Universe pageant, which took place in Moscow in 2013, and Trump's decision to sell a Florida mansion to a Russian oligarch in 2008, according to Bloomberg.

They're also examining dealings with the Bank of Cyprus, and Jared Kushner's attempts to secure financing for his family's real estate properties.

Wilbur Ross, Trump's commerce secretary, served as vice chairman of the Bank of Cyprus before joining the administration. Kushner is the president's son-in-law and a senior White House aide.

Mueller's investigation into Trump's business transactions stemmed from a money laundering probe started by former Manhattan U.S. Attorney Preet Bharara, according to Bloomberg.

Trump asked Bharara, along with 46 other U.S. attorneys appointed by former President Barack Obama, to resign earlier this year. When he refused, Bharara said he was fired.

Bharara's investigation became part of Mueller's probe, which also includes lines of inquiry into Russia's attempts to interfere in the 2016 election, contacts former national security adviser Mike Flynn had with Russia, and Russian hacking.

Mueller's team is looking into the 2013 Miss Universe pageant, which Trump owned, because Aras Agalarov, a Moscow developer, paid $20 million to host the event there. Roughly one-third of that amount went to Trump as part of a licensing fee, according to Forbes.

During the 2013 pageant, Trump met Herman Gref, the head of Russia's largest bank, Sberbank PJSC.

Agalarov's son, Emin, helped orchestrate a meeting that took place at Trump Tower last year between Donald Trump Jr., Kushner, and former Trump campaign chairman Paul Manafort, and a Russian lawyer.

The lawyer was said to have damaging information about Hillary Clinton.

During an interview with the New York Times on Wednesday, Trump warned against Mueller and his investigators looking into matters too far from Russia.

"I think that's a violation. Look, this is about Russia. So I think if he wants to go, my finances are extremely good, my company is an unbelievably successful company," Trump said.