NCAA President Charlie Baker is asking members to make one of the most dramatic shifts in the history of college sports by allowing highly resourced schools to pay some of their athletes.

In a letter sent to more than 350 Division I schools Tuesday, Baker said he wants the association to create a new tier of NCAA Division I sports where schools would be required to offer at least half their athletes a payment of at least $30,000 per year through a trust fund.

Baker also proposed allowing all Division I schools to offer unlimited educational benefits and enter into name, image and likeness licensing deals with athletes.

He said the disparity in resources between the wealthiest schools in the top tier of Division I called the Football Bowl Subdivision and other D-I members — along with the hundreds of Division II and III schools — is creating “a new series of challenges.”

“The challenges are competitive as well as financial and are complicated further by the intersection of name, image and likeness opportunities for student-athletes and the arrival of the Transfer Portal,” wrote Baker, the former Massachusetts governor who took over at the NCAA in March.

Division I is currently divided for football into the FBS, which has 133 schools, and FCS (Football Championship Subdivision).

Baker’s proposal is aimed at creating a new subdivision, covering all sports, where the richest athletic departments in the so-called Power Five conferences — the Big Ten, Southeastern Conference, Big 12, Atlantic Coast Conference and Pac-12 — can operate differently than the rest.

Conference realignment starting in 2024 will move the Pac-12 out of that group.

The proposed shift would not require all members of a conference to be part of the new subdivision. Schools would be allowed to make that determination individually.

Baker noted athletic budgets in Division I range from $5 million and $250 million annually, with 59 schools spending over $100 million annually and another 32 spending over $50 million. He said 259 Division I schools, however, spend less than $50 million on their athletic programs.

Baker said the difference in the way schools that participate in revenue-generating college sports such as major college football and basketball operate and the vast majority of college sports is complicating attempts to modernize the entire enterprise.

“The contextual environment is equally challenging, as the courts and other public entities continue to debate reform measures that in many cases would seriously damage parts or all of college athletics,” he wrote.

Baker and college sports leaders have been pleading with Congress to help the NCAA with a federal law to regulate the way athletes can be paid for NIL deals.