What to watch: The list of probable investigations includes everything from Trump's tax returns to his family businesses, his dealings with Russia, and his travel ban and family separation policy.

• House Minority Leader Nancy Pelosi, who's in line to become speaker, set the tone Tuesday night when she declared that a Democratic House will be "about restoring the Constitution's checks and balances on the Trump administration."
• House Democrats can't pass their own agenda and expect Trump to sign it, but they can stop much of his congressional agenda in its tracks. And they don't have to give him the money he wants for priorities like the border wall — but he and Senate Republicans could try hardball tactics to force their hand.

The bottom line: Get ready for two years of non-stop fighting between House Democrats, Senate Republicans and Trump — all setting the stage for a brutal presidential election in 2020.