“unless they conspired with a foreign government”............
The Constitution defines treason in the US:
Article 3 - The Judicial Branch
Section 3 - Treason
Treason against the United States, shall consist only in levying War against them, or in adhering to their Enemies, giving them Aid and Comfort. No Person shall be convicted of Treason unless on the Testimony of two Witnesses to the same overt Act, or on Confession in open Court.
The Congress shall have power to declare the Punishment of Treason, but no Attainder of Treason shall work Corruption of Blood, or Forfeiture except during the Life of the Person attainted.
In Trump speak, Treason is like cement. People who think cement is concrete are like those that think treason is sedition.
Trump is using treason as a metaphor for sedition.