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 HagelThe Hill's 12:30 Report The Hill's 12:30 Report Billionaires stopping climate change action have a hold on Trump, GOP MORE, Sen. Marco RubioMarco Antonio RubioOvernight Defense: Tillerson, Trump deny report of rift | Tillerson says he never considered resigning | Trump expresses 'total confidence' in secretary | Rubio asks Army to kick out West Point grad Rubio asks Army to kick out West Point grad with pro-communist posts GOP establishment doubts Bannon’s primary powers 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 Finance: Lawmakers grill Equifax chief over hack | Wells Fargo CEO defends bank's progress | Trump jokes Puerto Rico threw budget 'out of whack' | Mortgage tax fight tests industry clout Michelle Obama is exactly who the Democrats need to win big in 2020 Wells Fargo chief defends bank's progress in tense Senate hearing MORE, (D-Mass.)

CNN's "State of the Union:" Rep. Michele BachmannMichele Marie BachmannTom Petty dies at 66 Bachmann: Muslim immigrants trying to undermine Western civilization Religious leaders pray over Trump in Oval Office MORE, (R-Minn.), Rep. Debbie Wasserman Schultz, (D-Fla.), former senator Rick Santorum, (R-Penn.)

"Fox News Sunday:" Rep. Trey GowdyTrey GowdyCummings demands documents about Conway's flights with Price Dems call for 'emergency' hearing on Trump's hurricane response Democrats unveil bills to ban Cabinet members’ private jet travel MORE, (R-S.C.), Rep. Xavier BecerraXavier BecerraOvernight Regulation: Trump temporarily lifts Jones Act for Puerto Rico | Bill would exempt some banks from Dodd-Frank | Senators unveil driverless car bill Calif. AG: Trump backs down on greenhouse gas rule Overnight Energy: California cities sue oil giants over climate change 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.