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The problem: the situation in the Ukraine. If tension between the U.S. and Russia worsens then Russia might suspend carrying American astronauts to and from ISS.
The fault here belongs with Congress and George Bush, who decided in the 2000s to let the shuttle retire before its replacement was ready. In addition we can blame Congress in the 2010s for forcing NASA to spend billions on the unaffordable Space Launch System rather than focus on getting humans into space cheaply and quickly.