Are phones being checked at port of entry?

Based on the French green card holder being deported because of the content authorities found on his phone, is it safe to assume that everyone’s phones should be unlocked and shown to the officers at the port of entry? No matter whether you’re a citizen or green card holder?

EDIT 1: I understand now that no one has any rights when it comes to CBP. My question now is: Should a US Citizen or Green Card holder be prepared to have their first amendment rights also denied if the officer finds that you bad mouthed the administration in one of your private conversations to your friend?

EDIT 2: I ask this question because of the sudden surge in unwarranted searches. For those who say this has been happening in the Obama and Biden searches, I get it. In any administration CBP should have full authority to prevent bad actors from entering the US. But given the sentiment of the current administration, I’m worried that the officers are misusing their power on innocent people because there are no consequences. You don’t have to look too far back in history to see examples.