Last year, lawmakers threatened to hold back $18.5 million if the public university system did not put a cap on students from outside California. On Monday, UC finally acted, proposing a 20% systemwide limit on nonresident undergraduate enrollment and vowing to continue to give Californians top priority. Nonresident students numbered 34,673 in fall 2016, 16.5% of the system’s 210,170 undergraduates. The limit would be the first of its kind for the 10-campus public research university. But UC officials hope it will be enough to get state officials to release the funds.