Seven Palestinians in Gaza received Fulbright grants this year. In May the US State department cancelled the grants because Israel closed the border between Gaza and Israel and the State department was afraid they couldn't get them out. After some noise got made, Condoleeza Rice stepped in and got the grants reinstated. Israel let in four of the seven so they could go to the American consulate to get visas but denied the other three for security concerns. For the other three, Rice got the state department to send a team and equipment into Gaza to help the remaining students who eventually got visas on July 30th.
Sounds like a happy ending. Alas that's not the end of the story.
A few days later, Fidaa Abed, one of the three, flew from Jordan to Washington and when he landed he learned that his visa was no longer valid. He was put back on a plane to Jordan. The other two hadn't left yet but their visas were also canceled. The decision to revoke the visas came after the US State Department received more information, probably from Israel.