The polls were not wrong about Clinton. Clinton's lead over Trump in the battleground states were within the margin of error. The popular vote doesn't determine victory for presidents. The electoral college does.

This is what I keep telling people. The polls were pretty much bang on in 2016: https://i.imgur.com/Rrd1ACR.png

"The polls were wrong!" Everyone says.
No, the polls were right. What was wrong was the media's interpretation of the polls. They just assumed the higher percentage nationally was a win, because they were too lazy tabulate by electoral region.