If you want to know what is bringing us to a "Constitutional Tipping Point" look no further than the abuse of filibuster in the Senate and abuse of power from the Speaker of the House and Senate Majority Leader
The abuse of Congresional rules has brought the Congress to the point they can't execute the most basic functions without creating a national crisis
One of the three branches of government not working is indeed a Constitutional crisis
Actually two, the executive and the legislative. The other branch is the judicial branch.