Travel ban

U.S. President Donald Trump responded to several terrorist attacks (inside the continental United States) with a proposed "travel ban". His intent was to restrict immigration from countries that are rife with terrorism – as a temporary emergency measure – until the government could figure out a long term solution.

President Donald Trump has signed a new executive order blocking the arrival of most travelers from six conflict-prone countries for 90 days ...

The proposed ban, actually a temporary suspension, was blocked for several months by various federal judges. In late June 2017, however, the U.S. Supreme Court partly lifted the block and agreed to hear the case in October.

Trump said:

Today's unanimous Supreme Court decision is a clear victory for our national security. It allows the travel suspension for the six terror-prone countries and the refugee suspension to become largely effective.

The SCOTUS ruling exempts any foreign national with a "bona fide" relationship with any US citizen or institution from the travel ban:

"In practical terms, this means that [the executive order] may not be enforced against foreign nationals who have a credible claim of a bona fide relationship with a person or entity in the United States.

All other foreign nationals are subject to the provisions of [the executive order]."

The Supreme Court did not address when the 90 days starts - as of the date of the original Executive Order (in which case it expired on June 14) or June 26. The reason there is doubt because the Executive Order was amended on June 14 to provide that the 90 days does not go into effect until the travel ban starts. In either case, the Supreme Court oral argument will occur more than 90 days later, so the Court has asked the parties to consider whether the case is moot, that is whether the Trump Administration has had sufficient time to implement their new plan for "extreme vetting" of visitors from the designated countries.