NEW YORK (AP) -- Free preschool for 4-year-olds was a signature issue that helped New York City's mayor win office in 2013.
Now up for re-election, he wants to add thousands of classroom seats for 3-year-olds, too.
Mayor Bill de Blasio's initiative could eventually enroll up to 62,000 kids.
It would be among the largest public investments in preschool in the United States for children that young.
A few states, including Florida and Oklahoma, have universal, publicly funded pre-K for 4-year-olds, but such programs for 3-year-olds are more rare.
Education advocates said the plan announced last week by the Democratic de Blasio could be a national model if it succeeds.
The mayor's critics say he should focus on improving existing schools before adding another year to public education in the city.