This morning a crewed Soyuz booster failed, causing the crew to return to Earth, as the capsule was not in orbit yet. With this being the second failure of a Soyuz rocket in two years (a Dec 2016 resupply also failed), it's likely the Soyuz will, at the very least, be grounded in the short term. In the long term, NASA may be forced to abandon the Soyuz altogether.
This raises the serious question of what will happen to the ISS now. There are no other approved methods of sending crew into space at present. SpaceX and Boeing are in the process of being certified to carry crewed rockets, but neither seems likely to be approved for at least another year (and, given the repeated delays in both programs, that is optimistic).
Is there anything NASA can do to accelerate these programs to keep crews going to the ISS? I know that there was discussion of crewing the first SLS launch. Could NASA just tell SpaceX to put a Dragon atop a Falcon Heavy and send them on their way?