That said, Article I Section 9 Clause 2 says:
The privilege of the Writ of Habeas Corpus shall not be suspended, unless when in Cases of Rebellion or Invasion the public Safety may require it.I don't think anyone would disagree that an attempted assassination of a former President and current Presidential candidate is an act of rebellion against the United States. Therefore, suspending the writ of Habeas Corpus for Routh would be Constitutional.
On the other hand, I suppose the same thing could be argued for the indefinite incarceration of the J6 defendants, but in their cases I don't think the "public Safety" requires it as it would with an assassin who was caught in the process. The J6 defendants are not going to "riot" or "attack" the Capitol building again (or any other government building).
-PJ
In Routh’s case, one would think that the “prosecution” would want to get this to trial ASAP. But I’m no lawyer…