First up on Monday, Trump’s former top National Security Council Russia specialist Fiona Hill is expected to give a deposition to House committees — and could shed some light on the behind-the-scenes maneuvering between Trump, administration officials and outsiders acting on his behalf in Ukraine, including Trump’s personal lawyer Rudy Giuliani.

Then, the end of a two-week congressional recess on Tuesday will heighten tensions over the most consequential duel over the fate of a presidency in at least 20 years, with new testimony expected from key figures in the scandal.