Two former top staffers to Senate Majority Leader Mitch McConnell have lobbied Congress and the Treasury Department on the development of a new Kentucky aluminum mill backed by the Russian aluminum giant Rusal, according to a new lobbying disclosure.

The disclosure comes as Democrats are pushing the Trump administration to review Rusal’s $200 million investment in the Kentucky project — concerned that the mill will supply the Defense Department — and as McConnell weathers criticism for helping block a congressional effort to stop the investment.