WASHINGTON – If President Trump looks tired Tuesday it’s not just because of the jet lag.

Former top Hillary Clinton aide Philippe Reines devised a plan to keep the president up all night post-Putin meeting – blaring an air horn in front of the White House as part of a protest he helped organize with a tweet.

“If someone flew home from Helsinki they’d get back to D.C. around 9 p.m. Probably jet lagged. You know what I’d hate if I just got home [and] needed to sleep?” the former State Department staffer wrote on Twitter.

“A bunch of people outside my home with bullhorns & air horns.”

He tagged the liberal group MoveOn.org and asked how to start a protest. The tweet did just that.

“From there it just took off. Clearly there was a lot of anger specific to yesterday. People wanted to act,” Reines told The Post in an email.

Reines did his part by bringing an air horn and handed out both whistles and ear plugs for those who joined the crowd – which included a cameo by Rep. Joaquin Castro (D-Texas). He estimated that at its high point between 550 and 560 people showed up.

“When Newt Gingrich is slamming Trump you know it’s bad,” he said.

Reines plans to return to Pennsylvania Avenue Tuesday night with a guest appearance by Stormy Daniels’ attorney Michael Avenatti and possibly another “big name.”