A former Watergate prosecutor watched as President Richard Nixon suggested four of the Supreme Court justices he nominated would remember what he did for them — and repay. It failed for him — and it will fail for Donald Trump too, he said. Donald Trump’s lawyer, Alina Habba, appeared to call in a favor fromJustice Brett Kavanaugh last week, saying that Trump did a lot to help him when everyone else suggested he pull the nomination, suggesting it was time to repay. She didn’t elaborate. POLL: Should Trump be allowed to run for office? Jon Sale, the former Watergate prosecutor, told MSNBC that o…