No. Treason is tightly defined in the Constitution and under the law, and this is not treason.
Violation of Oath?
No. This is just politics.
Can he be recalled?
No. Senators and congressmen cannot be recalled. This has been litigated in federal court (Idaho, 1967) and state court (New Jersey, 2013).
Prosecuted?
No. There is no crime.
Impeached.
But like the rest, not used, except as distraction from greater crimes to allow the Swamp to keep Billy Hilly in office.
So we are SOL,