grain of salt

"POWs are a particularly vulnerable category of witnesses, any evidence they give should be taken with a grain of salt."

She instead says that they are long-term strategic moves, and that the figures should be taken "with a little bit of a grain of salt".

“Taiwan is taking it with a grain of salt. I think there’s an understanding that nice, big, round numbers create bargaining positions, but may not be the final numbers that are agreed on,” said Wen-ti Sung, a political scientist at Australia National University who specializes in cross-strait relations.

James learned to take everything with a grain of salt.

I’m from DOJ and I spent a lot of time there so take this with a grain of salt, but this is humongous in DOJ’s history.