Businesses and conservative groups are aggressively pushing back against a Trump administration proposal that they fear would give the Commerce Department sweeping new powers to block any international transaction on national security grounds.

“There’s no due process. [Commerce Secretary] Wilbur Ross can terminate a transaction with a snap of his fingers, even retroactively, with this proposal,” said Brandon Arnold, the executive vice president of the National Taxpayers Union, a right-of-center taxpayer advocacy group.