Non-American here, trying to puzzle things out.
If I understand correctly, a US president can grant pardons, but only for federal crimes.
If I understand correctly, impeachment is a political act, and not a crime as such.
Would a senate trial following an impeachment be a federal crime?
If so, could a president be advanced pardoned for such a trial?
I understand that there is uncertainty as to whether a president can pardon him/herself. So, let us posit that they resign and are given a blanket pardon along the lines of that given by Ford to Nixon. Could that pardon apply to a senate trial following impeachment?