• Oil price drop to mid $20s seen without OPEC intervention
  • Waterboarding needed to deal with Islamic State, Trump says

Here are the highlights of Sunday’s top news stories from around the world:

The $150 billion merger of drug titans Pfizer Inc. and Allergan Plc is expected to be announced early Monday. The deal, which would be the biggest pharma deal ever and among the largest of any kind, is being constructed as a takeover by the much smaller Allergan -- a so-called inversion that may allow the combined company to cut taxes by moving its official address outside the U.S.

CVC Capital and the Canadian pension fund are said to have beaten out KKR and Apollo, among others, in bidding for the pet products retailer Petco. The price: $4.7 billion.

Brussels will stay largely shut down Monday despite being quiet through the weekend, with authorities warning they still think a multi-target terrorist attack like the one in Paris may be imminent.

Mauricio Macri, the Argentine opposition leader who has vowed broad economic reforms, looks to be the country’s next president.

Sunday was The Donald’s day once again, this time with U.S. Republican presidential front-runner Trump saying he’d bring back waterboarding if elected because the Islamic State chops people’s heads off.

Oil prices may drop to as low as the mid-$20s a barrel unless OPEC takes action to stabilize the market, Venezuela’s oil minister said.

It was no fluke if you went to see the film finale of “The Hunger Games” over the weekend and didn’t have trouble finding seats.

President Obama said Russia needs to make a decision on whether it’s going to support a broad campaign against Islamic State or prop up Syrian President Bashar al-Assad. Russia said it wouldn’t have to deal with Islamic State at all if not for U.S. policy failures.

U.S. Senator David Vitter’s loss in the Louisiana governor’s race -- the first time a Republican has lost a governor’s race in the South since 2008 -- showed that playing on fears of Syrian refugees doesn’t work if pocketbook issues are foremost on voters’ minds.

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