U.S. and China agree crackdown on flow of fentanyl

<p>China and the U.S. have agreed on a deal to crack down on the manufacture and export of fentanyl from China, in the hopes of curbing overdose deaths in North America. Vanda Felbab-Brown, a senior fellow at the Brookings Institution, explains what it might mean for the toxic drug crisis and U.S.-China relations.&nbsp;</p>