http://www.usatoday.com/story/news/...donald-trump-lawsuits-legal-battles/84995854/ Donald Trump is a fighter, famous for legal skirmishes over everything from his golf courses to his tax bills to Trump University. But until now, it hasn’t been clear precisely how litigious he is and what that might portend for a Trump presidency. An exclusive USA TODAY analysis of legal filings across the United States finds that the presumptive Republican presidential nominee and his businesses have been involved in at least 3,500 legal actions in federal and state courts during the past three decades. They range from skirmishes with casino patrons to million-dollar real estate suits to personal defamation lawsuits. The sheer volume of lawsuits is unprecedented for a presidential nominee. No candidate of a major party has had anything approaching the number of Trump’s courtroom entanglements. Just since he announced his candidacy a year ago, at least 70 new cases have been filed, about evenly divided between lawsuits filed by him and his companies and those filed against them. And the records review found at least 50 civil lawsuits remain open even as he moves toward claiming the nomination at the Republican National Convention in Cleveland in seven weeks. On Tuesday, court documents were released in one of the most dramatic current cases, filed in California by former students accusing Trump University of fraudulent and misleading behavior. The legal actions provide clues to the leadership style the billionaire businessman would bring to bear as commander in chief. He sometimes responds to even small disputes with overwhelming legal force. He doesn’t hesitate to deploy his wealth and legal firepower against adversaries with limited resources, such as homeowners. He sometimes refuses to pay real estate brokers, lawyers and other vendors. As he campaigns, Trump often touts his skills as a negotiator. The analysis shows that lawsuits are one of his primary negotiating tools. He turns to litigation to distance himself from failing projects that relied on the Trump brand to secure investments. As USA TODAY previously reported, he also uses the legal system to haggle over his property tax bills. His companies have been involved in more than 100 tax disputes, and the New York State Department of Finance has obtained liens on Trump properties for unpaid tax bills at least three dozen times.