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That depends on the nature of your employment and the potential motivations the employer may have for this treatment.
First, if you have an employment contract stating that you can only be terminated for cause, then you have the right to sue for breach of that contract, based on the requirement to truly establish cause. However, if you have no such contract (like most employees) your employment is "at will" which means it can legally be terminated at any time, with or without cause. When a cause is given, it doesn't have to be accurate. So, just the unfairness of the situation, in an "at will" employment situation, doesn't make it illegal. You'd have to look to their underlying motivation.
Second, if you have evidence to suggest that basis for this treatment is your race, religion, gender, age, disability or recent medical leave use (FMLA), then you can file an EEOC complaint top deal with the illegal motivation/discrimination. Even in an "at will" situation, terminating someone based on illegal forms of discrimination isn't permitted.
Finally, if you have no contract and can't allege discrimination based on one of those factors, then the treatment and pending termination would be legal. However, you still have the ability to fight to obtain unemployment, against the employer's claims of termination based on misconduct (the write ups that aren't really yours).
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