Last night, President Barack Obama joined Jimmy Kimmel yet again and read some mean tweets. But it wasn't all fun and games for the president—he also got pretty serious about the upcoming election between Donald Trump and Hillary Clinton.

When the two sat down, Kimmel asked Obama, "Do you ever wish you were running against Donald Trump?" As Obama and the rest of the audience laughed, Kimmel noted that Joe Biden recently said he wanted to fight Trump.

"Hillary's doing just fine," Obama replied without pulling a Biden. "I am enjoying campaigning on her behalf, and also for Senate and House candidates."

But then he got serious: "We joke about Trump, but I do think part of reason you’ve seen [First Lady] Michelle [Obama] passionate in this election, part of the reason that we get involved as much as we have is not just because we think Hillary’s going to be a great president, but it’s also because there’s something qualitatively different about the way Trump has operated in the political sphere."

He noted that his two opponents, John McCain and Mitt Romney, were "both honorable men." Unlike if Trump wins the presidency, Obama "wouldn't worry about the general course of the country" if McCain or Romney had won.

On the other hand, Obama explained, "What we haven't seen before is somebody questioning the integrity of elections and the will of the people, what we haven't seen before, I think, is politics based on putting down in very explicit terms, Muslim Americans who are patriots, or describing women, not in terms of their intellect and their character, but on a 1 to 10 score." He continued, "Regardless of what your political preferences are, there is a certain responsibility and expectation in terms of how you behave, how you present yourself." 

Obama also praised Trump's opponent, Hillary Clinton: "Having worked with her, she is smart as a whip, she works really hard, she cares deeply about working families in this country, and she's not somebody who thinks the job is about flash and sizzle and making speeches. It's about getting policy right and making sure that folks are doing a little bit better."

After Obama finished explaining "why I take this election very seriously," Kimmel chimed in, "You should've sold hats though," before going to commercial.

You can watch the clip above, or you can watch Obama reading mean tweets here.