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Shanks said more than 80 potential investors in the site had come forward, with Scottish Enterprise handling due diligence on proposed projects.

“DHS enforcement operations are highly targeted, and officers do their due diligence,” she said.

Members of Congress have significant oversight power, which involves doing due diligence on what actions the executive branch is taking and making sure they’re complying with laws that Congress has passed.

"You will need to make sure you are doing your due diligence," Cdr Murphy said.

"The public has a right to know whether this was a fair and impartial process, or yet another case of political patronage disguised as due diligence," he said.