US President Trump signs proclamation to restrict foreign student visas at Harvard

United States President Donald Trump has signed a proclamation restricting foreigners seeking student visas to study at Harvard University. The White House says the directive also requires US Secretary of State Marco Rubio to consider revoking the visas of existing international students at the institution. The move marks the latest in the administration's tussle with the Ivy League school to force it to comply with its demands. Toni Waterman reports on the economic impact of the ongoing row.