Okay, apology accepted. My apologies if I misunderstood you.
Let's try this again and break it down piece by piece.
"I complained to my employer about comments he made about me to a senior government manager whereas he stated that I had made "slanderous comments about another amployee", which I had not. "
This does not offer you any protection from retaliation. Complaining about your manager is not a protected right.
"Once the correspondence and subsequent discussion became hostile and seemd unresolable, I mentioned to my employer that I felt harrassed and discriminated against and thought the situation should be elevated to DOL or EEO. "
In order to meet the legal definition of a hostile working environment, you need to establish that you were being subjected either to sexual harassment or illegal discrimination under Title VII (race, religion, national origin etc.). Neither discrimination nor harassment on the basis that you complained about a manager is illegal. Neither the DOL nor the EEOC would touch this complaint.
"A week later, he was in town, and after a "closed door" meeting with the top government manager, I was informed that my position was being abolished. I was told I would have to apply for another position, or be given a two week notice of termination. I applied and was selected for the position. I was then told that my pay would be substantially cut. The new position was at the "5th level" on the organizational chart. My previous position was at the executive "2nd level". I reported directed to the government director. A few days later, I was moved from my office to a cubicle. My title changed, job description changed and I was dropped from the executive team appointment."
None of this is even remotely illegal.
"I spoke with another senior gov't manager and voiced my concerns about the environment becoming hostile "
Again, this does not meet the legal definition of a hostile work environment.
"that I felt I was being retaliated against "
Even if this is true (and I'm not saying it isn't) it is NOT illegal retaliation.
"The rumor of me possibly leaving got back to my employer, and he reminded me that I worked for him and not the government and that the company policy was two weeks notice in writing. I told him I would comply with the policy if I decided to leave. A week after that, my employer called me and asked me to "pick a date for my last day". "
He has that right.
"I told him I had reconsidered as the government POC had requested and I would not be leaving afterall. He told me to pack my belongings and leave."
They are not legally obligated to allow you to rescind a resignation. It's not entirely clear whether you had definitely communicated a decision to leave, but if you did, that's it; they have no obligation to allow you to return. If you didn't, it's clear that he no longer wanted you working there. Unless you had a bona fide contract that specified a term of employment and the terms under which you could be terminated, which this violated, you were an at-will employee and can be fired at any time, just as you can quit at any time.
"My computer was locked down and I was escorted from the building."
While I understand that this was embarassing, it was not illegal and gives you no legal recourse.
"He also denied UI benifits."
No, he didn't. He doesn't have the power to either grant or deny benefits. He may well have contested your benefits (which is his right) but only the state has the power to deny your benefits. As I said, it's not 100% clear if you resigned or were fired, but about 99.9% of the time, if you quit, you don't get benefits.
"Do I have any rights here?"
You have the right to appeal the denial of your benefits. That's about it. No laws were broken and your termination, if that's what it was, was legal.