of thew, bradley olson wall street journal discusses the u.s. stock market and its impact on oil prices and the energy sector. after that, professor harold pollack looks at how the single-payer health care system would work. that plan currently is endorsed by democratic presidential candidate bernie sanders. and we will take your phone calls and look at your facebook comments and tweets. all in washington journal live saturday morning at 7:00 eastern here on seas and. -- on c-span. >> this weekend, saturday morning at 10:00, live coverage from new hampshire for the first in the nation presidential town hall with eight gop candidates, rand paul, jim gilmore, jeb bush, john kasich, chris christie, carly fiorina, rick santorum, and marco rubio. saturday, live coverage of a campaign rally in waterloo with senator ted cruz and tv own -- tv and radio host glenn beck. sunday afternoon, live coverage from iowa at a rally for donald trump. for the complete weekend schedule, go to our website, www.c-span.org. earlier today, the u.s. conference of mayors h