Washington (CNN) The Trump administration urged Congress Monday to put a cap on student loan borrowing, one of several proposals for updating the Higher Education Act.

"We want to encourage responsible borrowing," said a senior administration official on a call with reporters.

Currently, the amount an undergraduate student can borrow from the federal government is capped at $57,500 over the student's lifetime. But parents of undergraduates and graduate students face no such limits, and can borrow as much as they need -- with the price tag set by schools.

The administration official did not say what the administration's proposed limit would be, but specifically mentioned the PLUS loan program . Parents and students must show credit-worthiness to borrow from that program and the interest rate -- currently set at 7.6% -- is typically higher than the loans from other federal programs.

Some research suggests that unlimited borrowing may encourage colleges to drive up the price of tuition.