The Times reports on the horrors Trump has unleashed.

President Trump’s executive order on immigration quickly reverberated through the United States and across the globe on Saturday, slamming the border shut for an Iranian scientist headed to a lab in Boston, an Iraqi who had worked as an interpreter for the United States Army, and a Syrian refugee family headed to a new life in Ohio, among countless others.

Around the nation, security officers at major international gateways had new rules to follow. Humanitarian organizations scrambled to cancel long-planned programs, delivering the bad news to families who were about to travel. Refugees who were airborne on flights when the order was signed were detained at airports.

Reports rapidly surfaced Saturday morning of students attending American universities who were blocked from getting back into the United States from visits abroad. One student said in a Twitter post that he would be unable to study at Yale. Another who attends the Massachusetts Institute of Technology was refused permission to board a plane. Stanford University was reportedly working to help a Sudanese student return to California.

Human rights groups reported that legal permanent residents of the United States who hold green cards were being stopped in foreign airports as they sought to return from funerals, vacations or study abroad — a clear indication that Mr. Trump’s directive is being applied broadly.

It’s just disgusting and horrific and intolerable.

Mr. Trump’s order, enacted with the stroke of a pen on Friday afternoon, suspended entry of all refugees to the United States for 120 days, barred Syrian refugees indefinitely, and blocked entry into the United States for 90 days for citizens of seven predominantly Muslim countries: Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen.

The Department of Homeland Security said that the executive order barred green card holders from those countries from re-entering the United States.

…

The White House said the restrictions would protect “the United States from foreign nationals entering from countries compromised by terrorism” and ensure “a more rigorous vetting process.” But critics condemned Mr. Trump over the immediate collateral damage imposed on people who, by all accounts, had no sinister intentions in trying to come to the United States.

But we don’t need to be protected from foreign nationals entering from countries compromised by terrorism; those people are trying to get away from the terrorism.

An official message to all American diplomatic posts around the world provided instructions about how to treat people from the countries affected: “Effective immediately, halt interviewing and cease issuance and printing” of visas to the United States.

Confusion turned to panic at airports around the world, as travelers found themselves unable to board flights bound for the United States. In Dubai and Istanbul, airport and immigration officials turned passengers away at boarding gates and, in at least one case, ejected a family from a flight they had boarded.

Seyed Soheil Saeedi Saravi, a leading young scientist in Iran, had been scheduled to travel in the coming days to Boston, where he had been awarded a fellowship to study cardiovascular medicine at Harvard, according to Thomas Michel, the professor who was to supervise the research fellowship.

Well we can’t have that. Maybe he’s just planning to put little bombs in everyone’s heart.

Danielle Drake, a community relations manager at US Together, a refugee resettlement agency, told the newspaper that Mr. Trump’s ban reminded her of when the United States turned away Jewish refugees during World War II. “All those times that people said, ‘Never again,’ well, we’re doing it again,” she said.

On Twitter, Daniel W. Drezner, a professor at the Fletcher School of Law and Diplomacy, posted an angry message for Mr. Trump after the executive order stopped the arrival of a Syrian family his synagogue had sponsored.

I saw him on Rachel Maddow’s show last night. He was wrathfully eloquent.

Iranian green card holders who live in the United States were blindsided by the decree while on vacation in Iran, finding themselves in a legal limbo and unsure whether they would be able to return to America.

“How do I get back home now?” said Daria Zeynalia, a green card holder who was visiting family in Iran. He had rented a house and leased a car, and would be eligible for citizenship in November. “What about my job? If I can’t go back soon, I’ll lose everything.”

Shadi Heidarifar, a philosophy student recently admitted to New York University, said in a message on Twitter that she had spent three years applying to universities in the United States.

“I had to work to save money, gather documents. The application fees were so expensive that a whole family could live for a month” on them, Ms. Heidarifar wrote. When she was accepted recently, she was elated. “But now my entire future is destroyed in one second.”

It’s disgusting. Trump has pulled us into the abyss with him.