Former Vice President and presidential candidate Joe Biden explained to a scrum of reporters waiting for him in Delaware why he had specifically asked President Barack Obama not to endorse his candidacy.

“If you’re the best choice for the Democrats in 2020, why didn’t President Obama endorse you?” asked Fox News’ Peter Doocy, obviously going for the “gotcha” question. But Biden was prepared, and knocked Doocy for a loop.

“I asked President Obama not to endorse me,” Biden said. “Whoever wins this nomination should win it on their own merits.”

“Welcome to Delaware,” he added, turning away dismissively before Doocy could continue.

“You and your message made this about the debate about President Trump,” said an unidentified CBS reporter. “You’re going to have to get through the Democratic primary first, why are you the best choice?”

“That will be for the Democrats to decide,” Biden said, as he turned and walked away.

Watch the video below.