In the US, calling someone an 'Israel firster' is anti-Semitic

In recent years, certain anti-Israel elements in the US have been referring to American supporters of Israel as 'Israel firsters.' In particular, the term is commonly used by the despicable MJ Rosenberg of Media Matters, and by certain bloggers at the Center for American Progress. Obviously, the term implies dual loyalty of American citizens at best and no loyalty to the United States at worst -