(CNN) Before heading out on his trip to Japan, President Donald Trump spoke with the press Friday reasserting his claim that he is the "most transparent" President.

"I was the most transparent, and am, transparent President in history," Trump said , going on to cite how many interviews and documents special counsel Robert Mueller's team went through.

While it's difficult to judge levels of transparency between US presidents, Trump has worked to hide personal information from the public and did not fully cooperate with the Mueller investigation.

Facts first: Trump has refused to release his tax returns, has battled congressional subpoenas for his financial information and refused to be interviewed in person by Mueller's team.

Breaking decades of precedent, Trump never released his tax returns to the public and is working to block subpoenas from the House to access his financial records.