Sunday shows preview: Clinton and Sanders square off

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The showdown reflects an increasingly competitive primary race, with both candidates running neck-and neck-in the Iowa caucuses less than three weeks before ballots are cast.
A slew of Republican primary candidates will also make appearances on the day.
Here are the rest of Sunday’s expected guests:
ABC’s “This Week”: Clinton headlines the program, followed by Sanders and Trump.
CBS’ “Face the Nation”: Clinton leads off again, followed by a taped interview with Sanders.
Republican presidential hopeful Marco RubioMarco RubioObama seeks down-ballot gains after being midterm loser Chamber endorses bill to block proposed estate tax rules Juan Williams: When WikiLeaks leaked my cell number MORE will also be on in a taped interview to discuss his strategy heading into the Iowa caucuses, followed by fellow GOP presidential candidate John Kasich.
CNN’s “State of the Union”: A taped interview with Trump, followed once again by Clinton and Sanders.
“Fox News Sunday”: Cruz will be on the program to clarify comments he made disparaging “New York values,” followed by Speaker Paul Ryan (R-Wis.) to talk about the lower chamber’s 2016 agenda.
NBC’s “Meet the Press”: Clinton and Sanders make their final appearances of the day, followed by Rubio and fellow Republican presidential hopeful Jeb Bush.
The network will also release its latest NBC News/Wall Street Journal presidential poll.