GARDEN CITY - About 20 adjunct professors at Nassau Community College hit the picket line Monday over a contract dispute.

Adjunct faculty members walked out after the Board of Trustees failed to approve a new contract Monday afternoon. Professors say they have been working without a contract for three years.

The adjunct faculty union, which represents about 3,000 non-tenured, part-time teachers, is asking for a 4.9 percent pay hike.

In a statement to News 12, the school's Board of Trustees said, "The contract issues that need to be resolved should be addressed at the bargaining table and not on the picket line. The mission of this college is to protect the 24,000 students that it serves. The Board of Trustees did not feel this proposal served that interest."

Adjunct faculty members teach about 55 percent of the college's course offerings. Several hundred teachers are expected to walk the picket line, beginning at 8 a.m. Tuesday.