Trump declares state of emergency

President Trump, having failed to get Congressional approval for the money he wants to build a wall along the US / Mexico border, has declared a national emergency to try to access other federal funds. How will this go down within the Republican party?

Also in the programme: the impact of opioids in Massachusetts; and can gene editing help poor farmers?

(Image: US President Donald J. Trump, after declaring a national emergency to attempt to build his long-promised border wall. Credit: EPA/Erik S. Lesser)