(Reuters) -U.S. President Joe Biden on Monday vetoed legislation to add 66 new judges to understaffed federal courts nationally, a once widely bipartisan measure that would have been the first major expansion of the federal judiciary since 1990. The JUDGES Act, initially supported by many members of both parties, would have increased the number of trial court judges in 25 federal district courts in 13 states including California, Florida and Texas, in six waves every two years through 2035. In a message to the Senate formally rejecting the bill, Biden said it "hastily" creates new judgeships without addressing key questions about whether new judges were needed and how they would be allocated nationally.