DES MOINES, Iowa (AP) — Students at an Iowa college have ended their effort to expand a union representing student workers because of fear a federal board would reject their request and set back unions at colleges across the country.

Grinnell College student Cory McCartan helped organize the Union of Grinnell Student Dining Workers. He confirms Friday that the group withdrew its petition from the National Labor Relations Board on Thursday in the face of opposition from college administrators.

A smaller union representing only food service workers will remain.

McCartan says his group decided to drop their plans because of a belief that a board appointed by President Donald Trump wouldn’t give them a fair hearing and that a rejection would hurt existing student unions at other colleges.

A college spokeswoman didn’t immediately respond to a request for comment.