Rep. /www.huffingtonpost.com/topic/ted-lieu"}}" data-beacon-parsed="true">Ted Lieu (D-Calif.) majestically trolled Donald Trump by tweeting him a cheat sheet for his first big trip abroad as president.

As Trump jetted off for his nine-day jaunt to the Middle East and Western Europe on Friday, Lieu thought it prudent to give the president some advice to ensure he stays out of trouble while overseas.

“DON’T leak classified information,” was his top tip. He also felt compelled to state that Israel is an ally of the U.S., and Russia is not.

To: @POTUS @realDonaldTrump



Here's a cheat sheet for your 1st overseas visit.



From: @RepTedLieu, Member of House Foreign Affairs Committee pic.twitter.com/IFvhDHx0ts — Rep. Ted Lieu (@RepTedLieu) May 19, 2017

Lieu advised Trump not to talk about his controversial Muslim ban during his stop-off in Saudi Arabia, where caterers are reportedly planning to serve him steak with ketchup.

And in preparation for his visit to the Vatican, Lieu warned Trump that Pope Francis “knows climate change is real, hates your proposed wall and is not a fan of locker room talk.”

As of early Saturday, Lieu’s post had garnered more than 58,000 likes.

Lieu, who represents a district in Los Angeles County, has previously used the microblogging service to take aim at Trump. In April, he mocked the president’s inauguration crowd size claims by posting this snap from a town hall event:

Dear @realDonaldTrump: This was the bigly crowd at my Town Hall tonight. They don't like you. #ImWithTed pic.twitter.com/SNHSGV8h0z — Ted Lieu (@tedlieu) April 21, 2017