In an appearance on the Halloween episode of TBS’ “Full Frontal with Samantha Bee” on Monday, President Obama was asked to tell a “spooky” story about what happens when people don’t vote.

“Donald Trump could be president,” he answered. 

The president, who warned Bee that he was “still president for about three months” after she busted him about his graying hair, also said that “this is probably the most important election of our lifetimes.” 

He urged voters to “make sure their voices are heard” on issues such as climate change, gender equality, health care and college next week, adding that “the choices could not be clearer.” 

“Young people have a bigger stake in this election than anybody,” he said later in the episode after a bit in which Bee spoke with the vocal fry commonly associated with millennials.