on Vice President Cheney issued a stern warning to Democrats who are calling for a probe of what the White House knew before Sept. 11: don't play politics. Watch the report now. exclusivelyr1b.gif news_bush_george_rts.jpg l Warning Signs ABCNEWS http://play.rbn.com/?url=realone/abcnews/open/g2demand/020517terror.rm&rpcontexturl=abcnews.go.com/webcasts/realone/topnews_frameset.html&rpcontextwidth=460&rpcontextheight=180&rpurl=abcnews.go.com/sections/us/DailyNews/warningmemo020517.html PLAY rotary_default