Jerome Corsi

Updated at 8:58 p.m. ET

The House Judiciary Committee launched a broad investigation into President Trump's inner circle Monday, targeting figures who have worked in his administration and for the Trump Organization businesses.

The Russia imbroglio is barreling into another year that could deliver even more revelations and political heat than the last one — and maybe even a big finale.

The criminal cases of several key players are unresolved, new charges could be ripe, and House Democrats are set to sweep into Washington with huge ambitions about how to use their investigative and oversight powers now that they wield the majority.

Here's what you need to know: