Google, Facebook, Microsoft and other tech firms have joined the lawsuit filed by Harvard University and the Massachusetts Institute of Technology (MIT) last week to block Donald Trump administration's decision to ban foreign students taking only online courses. In a joint brief, the tech companies including PayPal said the student visa restrictions will "inflict significant harm" their businesses, reports The Hill. Some 180 academic institutions in the US have joined the lawsuit. On July 6, the US Immigration and Customs Enforcement (ICE) had unveiled new guidelines for F-1 and M-1 visas given to students restricting them to only students who take in-person courses or a combination of online and in-person courses. Those who take only online courses would not be eligible for the visa. (IANS)