From Axios

If Trump survives politically and is re-elected to serve another four years, Congress likely would have nowhere left to go in the event of another scandal, legal and political experts say — not because the House couldn’t impeach him again, but because it might be politically impossible.

So Democrats know they probably only get one shot at using impeachment to remove him from office.

Never before have we had a president who might be in a position to be re-elected after impeachment. Andrew Johnson wasn’t nominated for another term, Bill Clinton was already in his second term, and Richard Nixon resigned in his second term in the face of certain impeachment.

Yep. The Democrats need to think several moves ahead.