Trump's student-loan repayment overhaul faces a new lawsuit from the biggest public service and healthcare unions

A coalition of unions filed a lawsuit challenging President Donald Trump's student-loan borrowing caps. Bonnie Cash/UPI/Bloomberg via Getty Images A coalition of unions filed a lawsuit seeking to block Trump's student-loan changes. They said the administration violated legal procedure with its narrowed professional degree definition. Subsequent litigation challenging the Education Department's borrowing caps is ongoing. President Donald Trump's student-loan changes are facing another legal…