Congressional Republicans and their oil industry allies are gearing up to fight President Obama’s new bans on oil drilling in parts of the Arctic and Atlantic oceans.

Two Alaska lawmakers are exploring whether they should propose legislation to overturn Obama’s actions.

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“It’s pretty much unknown territory right now,” said Deborah Sivas, an environmental law professor at Stanford University Law School who has studied the provision Obama used. “I don’t think anything analogous to this has occurred before. It’s just a black box.”