If its been discussed my apologies, searching on my mobile doesn't always work well.
http://www.forbes.com/sites/robertwood/2015/11/25/passports-required-for-domestic-travel-in-2016-but-irs-can-revoke-passports-for-taxes/
Quick gist, due to several states not meeting new Fed guidelines for id, tsa may require passport instead of state licence. Additionally if taxes are owed it will prohibit travel as well. Figure Forbes is a fairly reputable source so I thought it worth discussion.
http://www.forbes.com/sites/robertwood/2015/11/25/passports-required-for-domestic-travel-in-2016-but-irs-can-revoke-passports-for-taxes/
Quick gist, due to several states not meeting new Fed guidelines for id, tsa may require passport instead of state licence. Additionally if taxes are owed it will prohibit travel as well. Figure Forbes is a fairly reputable source so I thought it worth discussion.