Those defamation suits can get really expensive.
Like this one against one of the Trump University students?
Trump also filed a $1 million defamation suit against former Trump University student Tarla Makaeff, who had spent about $37,000 on seminars, after she joined the class action lawsuit and publicized her classroom experiences on social media. Unable to prove malice, Trump University lost an anti-SLAPP lawsuit (under statutes designed to thwart legal intimidation of class action participants) and was ordered by a U.S. District Judge in April 2015 to pay Makaeff and her lawyers $798,774.24 in legal fees and costs.