While Mr. Schumer’s statement undoubtedly pleased American critics of Israel, for the Israelis it was meaningless, gratuitous and offensive.

Mr. Schumer ended his argument by lecturing our Israeli friends that if Mr. Netanyahu and his coalition remain in power, “then the U.S. will have no choice but to play a more active role in shaping Israel’s policy by using our leverage to change the present course.” This is a shocking statement that treats Israel differently from other American allies by threatening to intervene in their domestic democratic politics. In making American support for Israel conditional, Mr. Schumer harms Israel’s credibility among its allies and enemies alike.

Mr. Schumer’s statement will have every other democratic ally of the U.S. worrying that America may try to bully our way into its domestic politics. That will diminish our allies’ loyalty to us. Without dependable allies, we will have a much harder time protecting America’s security, prosperity and freedom.