A frozen pig's foot and a note laced with anti-Semitic rants were sent to Rep. Peter King's Capitol Hill office, a congressional source familiar with the situation confirmed to CNN Monday.

The source said the note included statements such as "evil Jews will return this hoof to Palestine." Neither King nor his aides have seen the package, the source said, because all mail sent to the U.S. Capitol is now screened and the package was intercepted before it went to his office. King's office was notified Monday afternoon.