Triangulation: (in politics) the action or process of positioning oneself in such a way as to appeal to or appease both left-wing and right-wing standpoints.
If you add the words “at different times, as required” it applies here:
The late Christopher Hitchens called out Bill Clinton for triangulation in No One Left to Lie To making the point that:
“Just as the necessary qualification for a good liar is a good memory, so the essential equipment of a would-be lie detector is a good timeline, and a decent archive.”
Christie is not a good liar now and he was not a good liar even when he didn’t know any better: