This was to determine the legality and constitutionality of President Trump's Executive order of banning immigrants and refugees from 7 Muslim-majority countries. The Executive order was announced on January 27th, and Federal Judge James Robart issued a temporary restraining order on February 3rd.
This was after a complaint lodged by the state of Washington and later joined by Minnesota, saying that the ban was causing irreparable harm to "employment, education, business, family relations and freedom to travel."
President Trump reacted to the restraining order with angry tweets, which included a dismissal of Judge Robart's ruling. White House asked the Ninth Circuit Court of Appeals in San Francisco to reverse the judge's decision and reinstate the travel restrictions.
The hearing, which was conducted through a call-in session saw Trump's lawyer have the hardest time trying to convince the three Judge bench of how the ban was beneficial to National Security.
Asked to show how banning the seven countries would reduce terrorism August Flentje, the attorney defending Trump's plans, had nothing to offer. Earlier he had claimed that Judge Robart's ruling had upset the balance the Trump administration had struck between welcoming people and making sure the country was secure.
When pressed further to cite evidence, he said a few things about the Obama administration's judgments towards the banned countries, but the Judges dismissed that angle as being too abstract.