Require politicians to take oath of office on U.S. Constitution instead of the bible.

There is suppose to be a clear separation of church and state, yet politicians use the bible to place their hands on when taking the oath of office. This practice should be banned and all politicians and justices should be required to place their hand on U.S. Constitution when taking the oath of office. This will remind them of what they are elected to do and follow, not personal beliefs.