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 HagelCharles (Chuck) Timothy HagelPentagon documents hundreds of serious misconduct cases against top brass Obama defense sec: Trump's treatment of Gold Star families 'sickens' me The Hill's 12:30 Report MORE, Sen. Marco RubioMarco Antonio RubioRyan pledges 'entitlement reform' in 2018 Richard Gere welcomes lawmakers' words of support for Tibet Dem lawmaker gives McConnell's tax reform op-ed a failing grade 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 Ann WarrenOvernight Regulation: Net neutrality supporters predict tough court battle | Watchdog to investigate EPA chief's meeting with industry group | Ex-Volkswagen exec gets 7 years for emissions cheating Overnight Tech: Net neutrality supporters predict tough court fight | Warren backs bid to block AT&T, Time Warner merger | NC county refuses to pay ransom to hackers Avalanche of Democratic senators say Franken should resign MORE, (D-Mass.)

CNN's "State of the Union:" Rep. Michele BachmannMichele Marie BachmannJuan Williams: The GOP has divided America Bachmann praises Trump as man of faith Tom Petty dies at 66 MORE, (R-Minn.), Rep. Debbie Wasserman Schultz, (D-Fla.), former senator Rick Santorum, (R-Penn.)

"Fox News Sunday:" Rep. Trey GowdyHarold (Trey) Watson GowdyTop intel Dem: Trump Jr. refused to answer questions about Trump Tower discussions with father Overnight Cybersecurity: Panel pushes agencies on dropping Kaspersky software | NC county won't pay ransom to hackers | Lawmakers sound alarm over ISIS 'cyber caliphate' Flynn told associate Russia sanctions would be ‘ripped up’ early in Trump presidency MORE, (R-S.C.), Rep. Xavier BecerraXavier BecerraOvernight Regulation: Net neutrality supporters predict tough court battle | Watchdog to investigate EPA chief's meeting with industry group | Ex-Volkswagen exec gets 7 years for emissions cheating California AG on Trump EPA: ‘It’s almost as if they believe they’re above the law’ Sanctuary city policies are ruining California — here’s why I left 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.