members of Congress or Congress as a whole.
For individual congress critters, impeachment should occur if the majority of the voters in their state want them inpeached
For Congress as a whole, if the majority of national voters wants congress impeached.
It should be on the ballot in every election.

My this time last year, grasses on the hills were already golden (browning).
I couldn't help myself, I planted annuals and replaced things that died during the drought.
How are you making out where you live?