New York: During the tumultuous first three years of his presidency, Donald Trump has experienced some damaging days. Friday (Saturday AEST) was up there with the worst.

The second day of public hearings in the impeachment inquiry against Trump began with gripping and emotionally moving testimony from an impeccable witness.

President Donald Trump on Friday. Credit:AP

As she was speaking, Trump jumped onto Twitter to lambast that witness - a move Democrats seized upon as a potential article of impeachment.

Then it was announced that one of the President's most longstanding allies, infamous "dirty trickster" Roger Stone, had been found guilty of multiple crimes and was headed to jail.