What's next for Trump's travel ban

The Supreme Court won't revisit President Trump's temporary travel ban until October, but a lot will happen before then that could affect the travel of millions of people around the world.
A scaled-down version of the travel ban that was approved by the court and goes into effect Thursday bars U.S. entry for citizens of Iran, Libya, Somalia, Sudan, Syria and Yemen without prior ties to the United States.
The administration also has started a review of anti-terrorism vetting procedures used to screen travelers from all countries, and that could prompt more travel restrictions against a greater number of countries.
Immigration advocates are preparing lawsuits in case they believe the government exceeds legal limits in the actions it takes.
Here's what you need to know about the next steps for Trump's travel ban:

WHO'S BLOCKED

As soon as the Supreme Court issued its decision Monday allowing the administration to implement a partial travel ban, attorneys in favor and opposed to the ban dived into law books to understand exactly what the justices meant.
The court ruled that the administration must allow entry of people from the six targeted majority-Muslim countries who can prove a "bona fide" relationship with a U.S. person or entity. They include close relatives of U.S. citizens, employees of U.S. companies, students at U.S. universities and refugees already approved for entry.
Starting Thursday, the administration can bar people who don't have such ties, which were not fully defined by the court.
Can an Iranian businessman making his first trip to the U.S. to meet potential American clients enter? Can a Syrian family just starting its application to become refugees continue that process? Can a Yemeni tourist who has already booked his flight and hotel room in the U.S. take that vacation?
Those questions remain unanswered. Shoba Sivaprasad Wadhia, director of the Center for Immigrants' Rights at Penn State Law, worries that State Department employees who grant visas overseas and Customs and Border Protection agents who screen foreign travelers at U.S. airports will take the most restrictive approach.
That's why Wadhia and other advocates for immigrants spent Tuesday coordinating teams of attorneys who can quickly deploy to airports to help detained travelers fight their cases. Amnesty International already has filed a Freedom of Information Act request to reveal the guidance the administration is giving to officers who will decide whether travelers are banned.
"The public needs to know exactly what agents in airports nationwide are being told to do, and we need to know now," said Margaret Huang, executive director of Amnesty International USA.
Others say the travel ban already has been scaled back so much by the Trump administration in a revised executive order — and further limited by the Supreme Court — that the number of people ineligible to enter will be very small. The revised ban allows all permanent legal residents, those already granted short-term travel visas, diplomats and employees at U.S.-based international organizations to continue traveling.
Only those with no links to the U.S., such as first-time tourists, may be barred.Ilya Shapiro, senior fellow of constitutional studies at the libertarian Cato Institute, said there are likely few Yemenis planning trips to Disney World or Somalis hoping to honeymoon in Hawaii.
"I don't know how many of those there are," Shapiro said.