margaret brenner. >> reporter: thank you, mr. president, some of your critics have pointed to the incredibly polarized political climate as contributing to the rise as someone as provacative as donald trump. do you feel responsibility for that? or even some of the protectionist rhetoric from some democratic candidates? do you have a time line for when you might make a presidential endorsement? and do you feel political heat is constraining your pool of viable supreme court nominees. >> that's a three-fer. i think it's important for me to nominate a supreme court nominee quickly, because i think it's important for the supreme court to have its full compliment of justices. i don't feel constrained in terms of the pool to draw from, or that i'm having to take shortcuts in terms of the selection and vetting process. with respect to your first question, i have heard this argument a number of times. i -- i -- i have -- i have been blamed by republicans for a lot of things, but being blamed for their primaries and who they are selecting