Obama also pivoted to criticizing Republicans after saying that Clinton had a plan to improve the economy.

"Now, the fact that we haven't gotten all these ideas done, it's not the fault of immigrants or unions or some liberal, socialist scheme. It's very simple!" Obama said. "Republicans in Congress and Republican governors have been blocking these ideas for the last eight years. It's that simple."

Zing!

Obama said Republicans picked a nominee whose "only plan is to build a bigger wall," referring to Trump's plan to build a wall along the border of the United States and Mexico. The crowd then booed.

"Don't boo," Obama said. "Vote. Booing doesn't help. You need to vote."

<img src="https://i.ytimg.com/vi/fVsbVtQU78g/hqdefault.jpg"&gt;