Post disputation argument

A post disputation argument is an argument in which one party attempts to alter their view on the disputed facts after the answer has already been discovered by an outside medium. It is an example of a fallacy.

Example:

Party one claims A is true. Party two claims B is true and A is false. Party one claims B is false. Party one and party two look in reliable source for the truth. According to the source party one is correct because A is true. Party two claims that they are correct and then restates their claim into argument B'.

Party two has changed their view after the truth was discovered and by changing their argument appears to have been right since the beginning. This is a post disputation argument. A post disputation argument is considered manipulative in the sense that often it is not used to clarify a party's initial stance but to change it so they appear correct after the truth has been discovered.