MURFREESBORO (AP) - State Rep. Joe Carr is proposing a state law to make it a crime in Tennessee for federal agents to enforce any effort to ban firearms or ammunition.

The Murfreesboro Republican said Wednesday that measure would also require the state's attorney general to defend any Tennessean prosecuted for violating the potential federal gun violations.

The move comes after President Barack Obama on Wednesday unveiled the most sweeping proposals for curbing gun violence in two decades a month after the Connecticut school shooting that left six teachers and 20 students dead.

The president called for universal background checks and bans on military-style assault weapons and high-capacity ammunition magazines.

Carr said the president's plan wouldn't prevent future shootings and instead called for more armed guards to be posted at schools.