Trump especially upset after hearing Mueller would access tax returns: report

President TrumpDonald John TrumpTrump: I hope voters pay attention to Dem tactics amid Kavanaugh fight South Korea leader: North Korea agrees to take steps toward denuclearization Graham calls handling of Kavanaugh allegations 'a drive-by shooting' MORE is troubled by the possibility that special counsel Robert MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE's investigation into possible collusion between the Trump campaign and Russia could expand to include an examination of Trump's and his family's finances.

The Washington Post reported late Thursday that the president has been particularly upset by the notion that Mueller could access Trump's personal tax returns, which he has repeatedly declined to release to the public.

As part of his investigation into the Kremlin's role in the 2016 presidential election and whether members of Trump's campaign coordinated with Russian officials or operatives to influence the race, Mueller is also looking at possible financial ties between campaign members and Russian interests.

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Bloomberg reported on Thursday that the special counsel has begun to look at Trump's business transactions, as well as those of his associates. 

In an interview with The New York Times on Wednesday, Trump accused Mueller of running an investigation riddled with conflicts of interest and said the special counsel would cross a line if his probe expanded to include the Trump family's finances.

Trump bucked a decadesold tradition during the presidential race by refusing to release his personal income tax returns.

He initially said his decision not to do so was because he was under audit by the IRS. He later said that the public "doesn't care" about his tax returns, and that only journalists were interested in obtaining them.

Every president since Jimmy Carter has released his returns.