Why did Trump make the "white power" hand signal when he mentioned AOC at the Young Conservatives DC summit?

[Wanderfound]

From 2016:

Poll: Trump at 1% among black voters

I’ve been saying this for months. Trump isn’t going to pivot to the centre; he’s choosing to base his campaign on hard-right racism, violence and voter suppression. The repeated Nazi-themed gaffes aren’t gaffes; they’re intentional.