CLEVELAND — Get ready for the Trump dynasty.

Donald Trump Jr., the eldest son of Donald Trump and a top campaign surrogate, is focusing on his career now — but he may run for elected office in the future.

“Maybe when the kids get out of school, I would consider it,” Trump Jr. said at a breakfast on Wednesday sponsored by the Wall Street Journal.

Some enthusiastic fans are urging him not to wait.

“How about Donald Trump, Jr. running for Mayor of New York City? I believe he can coalesce support & get De Blasio out of there,” tweeted Gene White, managing partner at Dewey Stone Group LLC.

Focus group guru Frank Luntz polled 18 participants during Junior’s convention speech last night and 15 wanted him in political office.

“He was so good, they felt his father should take lessons from him. They felt he humanized his father,” Luntz told The Post.

“I’ve been doing this since 1992, I’ve never seen a kid do so well. Reagan’s kids were not nearly as good.”

“A star is born,” said former GOP Sen. Alfonse D’Amato. “He rocked the house!”

“He’s more articulate than his dad — no doubt about it. He’s made a name for himself in business and politics.”

Trump Jr., the father of five, delivered Tuesday night’s best-received speech at the Republican National Convention, earning rave reviews even from critics of Donald Trump’s presidential campaign.

Trump Jr., 38, seemed to relish the praise, saying the “impossible” happened Tuesday night after his speech: Talking heads on MSNBC praised him.

“It’s certainly been exciting,” he said of his father’s campaign.

“Right now, obviously the focus is to help my father and do what I possibly can to make a difference, and just being a small cog in the wheel has been incredible.”