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Not subject to filibuster per se, but there was absolutely something they could have done. From TFA:
Under the process, Senate rules allow for members to propose an unlimited number of amendments.
So while not literally a filibuster, they could have effectively filibustered it by simply continuing to propose amendments, preventing the billi tself from ever coming to a vote. Once again, the Democrats are showing themselves unwilling to play hardball.
The Trump administration is giving you new excuses every day