The US Treasury Department has taken over a portion of the Department of Education's student loan portfolio from the Education Department, making up nearly $180 billion. The move is part of the administration's plan to dismantle the department, which was ordered to be dismantled a year ago. The Treasury Department will take over managing student loans whose borrowers have defaulted, accounting for 11 percent of the government's $1.7 trillion student debt portfolio. The change is expected to face legal challenges, with critics arguing that the law requires student loans to stay under the Education Dept. Borrowers will continue working with the same loan companies and continue paying in the same way. Critics argue that frequent rule changes are making it difficult for people to understand their options and could cause financial confusion.