...I can assure you that Mitt would not say the same about the Malignant Narcissist, Donald Trump.
You can also go to YouTube and find a glowing opinion of JB's character from another GOP Senator, Lindsey Graham.
Disagreement on policies is normal and expected, but easily refuted claims such as yours are non-productive.
Link: https://www.axios.com/2022/07/04/mitt-romney-biden-trump-atlantic