A new congressional probe into the State Department’s handling of the 2012 attack in Benghazi, Libya, and escalating unrest in Ukraine will likely dominate Sunday talk show news.

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Pro-Russian separatists in eastern Ukraine insist that a controversial referendum set for Sunday declaring sovereignty over the region will happen. The referendum will likely take place in the Donetsk and Luhansk regions of eastern Ukraine, where armed groups have been involved in deadly clashes with Ukrainian security forces recently. Several Western powers have condemned the planned vote as illegitimate as well as the interim government in Kiev. 

Meanwhile, House Republicans are moving forward with a select committee to investigate the Benghazi attack that left four Americans dead, including U.S. Ambassador Christopher Stevens.

The abduction of more than 200 Nigerian schoolgirls this week by Islamist terrorist group Boko Haram will also be a topic of discussion.

Here's the lineup:

ABC's "This Week:" Defense Secretary Chuck HagelChuck HagelWho will temper Trump after he takes office? Hagel: I’m ‘encouraged’ by Trump’s Russia outreach Want to 'drain the swamp'? Implement regular order MORE, Sen. Marco RubioMarco RubioTillerson met with top State official: report McCain ‘very concerned’ about Tillerson Top Dem: Don’t bring Tillerson floor vote if he doesn’t pass committee MORE, (R-Fla.), Rep. Adam Kinzinger, (R-Ill.)

NBC's "Meet the Press:" Pre-empted by coverage of Premier League soccer.

CBS' "Face the Nation:" Former Defense Secretary Robert Gates, House Intelligence Chairman Mike Rogers, (R-Mich.), Sen. Elizabeth WarrenElizabeth WarrenOvernight Finance: Scoop – Trump team eyes dramatic spending cuts | Treasury pick survives stormy hearing Dem senators to Trump pick: Probe if adviser violated Russia sanctions Warren burns Mnuchin over failure to disclose assets MORE, (D-Mass.)

CNN's "State of the Union:" Rep. Michele BachmannMichele BachmannEx-rep admires furs amid PETA inaugural gala Why Republicans took aim at an ethics watchdog Will Trump back women’s museum? MORE, (R-Minn.), Rep. Debbie Wasserman Schultz, (D-Fla.), former senator Rick Santorum, (R-Penn.)

"Fox News Sunday:" Rep. Trey GowdyTrey GowdyCongress asserts itself GOP rep says media is 'blurring' fact and opinion Oversight panel demands answers on Pentagon waste report MORE, (R-S.C.), Rep. Xavier BecerraXavier BecerraPoll: Former Sanders staffer gains steam in race to replace Xavier Becerra Mortgages rise out of reach for many Latinos House Hispanic Dems vie for more committee assignments MORE, (D-Calif.)

NPR’s “Weekend Edition Sunday:" Maria Korsnick, the first female chief nuclear officer in the U.S.; NPR’s Jeff Brady on the Keystone Pipeline project.