The rift originated from David's satirical essay, My Dinner with Adolf, which critiqued Maher's meeting with Donald Trump.
Maher had met with Donald Trump in April, subsequently describing the US president as 'gracious' and 'measured'.
David's essay, written from the perspective of a writer meeting Adolf Hitler, mocked Maher's comments about Donald Trump.
Maher defended his meeting with Donald Trump and criticised David's essay, calling it 'unhelpful and dumb' and questioning critics who refuse to engage with the US leader.