For several nights this month, searchlights have been illuminating the sky on the U.S.-Mexico border between El Paso, Texas, and Ciudad Juárez, Mexico. They don't have anything to do with stepped-up border enforcement. Instead, they're part of a binational art installation that aims to connect people on both sides of the Rio Grande.

Until Ambassador Gordon Sondland's public testimony on Wednesday, Vice President Mike Pence had managed to keep out of the center of the impeachment inquiry.

For the first time during the public phase of the impeachment hearings, a witness connected Pence to a possible quid pro quo. Sondland said that just ahead of a Sept. 1 meeting with the Ukrainian President Volodymyr Zelenskiy, he conferred with Pence about a link between U.S. military aid for Ukraine and the investigation that President Trump sought into former Vice President Joe Biden and his son, Hunter.

The marathon of testimony in Democrats' impeachment inquiry this week confirmed that the Ukraine affair, like so many earlier subplots in the era of President Trump, boils down to two big questions:

What do the president's words mean? Can the president do what he did?

The answers to those questions have been a partisan inkblot test since Trump exploded onto the political scene and now they are burning again as House Speaker Nancy Pelosi and House Democrats decide how they'll move ahead in a showdown over impeachment.

Herman Ware sits at a small, wobbly table inside a large van that's been converted into a mobile health clinic. The van is parked on a trash-strewn, dead-end street in downtown Atlanta where homeless residents congregate.

Ware is here for a seasonal flu shot.

"It might sting," he says, thinking back on past shots.

Ware grimaces slightly as the nurse injects his upper arm.