The U.S. State Department has opened an investigation into Harvard University's eligibility as a sponsor in the exchange visitor program, Secretary of State Marco Rubio said on Wednesday, as the Trump administration takes aim at the country's oldest and richest university.

The US State Department has said that it is opening an investigation into Harvard University’s continued eligibility as a sponsor for the Exchange Visitor Program, which allows foreign students and scholars to participate in exchange programs in the US.

The US State Department is opening an investigation into Harvard University’s “continued eligibility as a sponsor for the Exchange Visitor Program,” Secretary of State Marco Rubio announced on Wednesday,