No recall options on Senators but people think it could have been intended in Constitution and might be approveable by Supreme Court.
The 17-A (ratified in 1913 under guess hwho), forcibly removed states previous Constitutional Republic rights.
Progressives (principly fabian Socialists) in the Federal Government used the “democracy” argument, to essentially crush 125 years of previous state congresses ability to pick, and arguably hold accountable, their federal representation in the House and Senate.
It was a slick leftist trick.
Additionally, 14 Senators have been expelled from the federal senate - all Democrats except one (Blount), who had been a member of both sides of the isle.
We will never know now, but it seems plausible the original intent was for the states to be able to recall or punish betrayal sedition, and treasonous behavior and efforts.