In case that the police or any other authority proceeds against the right granted in the Fourth Ammendment, their findings, having been illegally obtained, can not be presented before any court as evidence against any individual, nor a judge could allow to have them as evidence in a trial, because this would ignore the Sixth Ammendment by violating the right to an impartial trial.
He didn't want to run for a third time; hes lost credibility and his popularity ratings were low because he supported the failed Embargo Act of 1807.
Catholicism maybe? Hope this helps!