How exactly Liberty got its name has been a source of debate over the years.

Exactly how the weapon was used is a source of debate.

In all cases the issue is a source of much heated debate.

This time range is a source of debate and promises to continue as such for years to come.

This time range is a hot source of debate and will be for years to come.

How to investigate and what these things are is the source of much debate.

It has been a source of controversy and debate around early development.

One more loss, and his future will become a source of local debate.

I'm sure the film will continue to be a source of debate and political education for many years.

For one thing, his political relationships have been a continuing source of debate.