The Senate also pulled out a change to the Pell Grant program, which provides federal aid to low-income students to attend colleges and universities. Right now, students are considered full time and qualify for the maximum amount of aid if they take 12 credits a semester.

Senate Republicans hope they are hours away from passing their massive tax and immigration bill. But the outcome is far from certain.

The revised package now heads back to the House, where Republican leaders hope to approve it and send it to Trump before a self-imposed July 4 deadline. But it faces hurdles.