WASHINGTON A scientist at Harvard Medical School planned to keep on collaborating with Iranian academics on HIV/AIDS research. Scholars at Columbia Law Schools human rights clinic wanted to study the impact of armed conflict on the mental health of people in Yemen, a country in the midst of a deadly civil war . And thousands of students from Muslim-majority countries hoped to attend American universities.

When President Donald Trump signed a temporary ban on travel from seven countries in January, all those plans were thrown into disarray. And although the revised ban, announced Monday, represents a major political defeat , it still leaves research projects in flux. Researchers warn that its likely to disrupt academic and medical work more than 7,000 doctors from the now-six impacted countries are practicing in the U.S. while discouraging bright students from coming to the United States.

The new travel ban, which goes into effect on March 16 , will last for 90 days and apply to Iran, Libya, Somalia, Sudan, Syria and Yemen. It will cover only those who have not already obtained visas, although even they can apply for a waiver .