It's the 84Lumber commercial from the Super Bowl; the one which crashed the website as gazillions of people tried to connect to see the second half.
That second half, starting about 2.30, is Deemed Too Controversial for TV by the graphic on the website.
Spoiler Alert. Don't read any further if you haven't seen the ad.
I have a quick rejoinder for those who will make this about illegal immigrants pouring across our borders, unchecked:
It's a door, not a window. It's solid, but there is light on the other side..