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the world. i'm wolf blitzer. you're in "the situation room." >> i saw a very upbeat newt gingrich this week. i spent time with him behind the scenes here in washington. before we sat down for our indepth interview. this is a man experienced big highs and big lows in his political career. and he's not ready at least publicly to presume he's got the republican presidential nomination all wrapped up. listen to our conversation here in washington. >> mr. speaker, thanks very much for joining us. we have new polls and i know you've seen those numbers and you're doing remarkably well. doub...

Before the caucus. and we'll ask secretary of state kerry whether it will hurt the u.s. economy. >> also, chicago mayor apologizes for how he handled the police shooting of a teenager. but protesters are still calling for him to resign. our sunday group on whether the mayor can hold on to his job. and our power player of the week, finding new ways to treat terrible diseases. all right now on "fox news sunday". >> and hello again, from fox news in washington. we'll have our indepth interview with donald trump in a moment. but first, a new fox poll which finds there's a tight battle for the lead...