Kamala Harris doesn’t just want to build more factories in the US if elected president. She also wants to help secure steady supplies of materials to fuel them.

A recent promise that embodies this approach is her proposed establishment of a “national reserve” of critical minerals such as cobalt, lithium, and nickel — the crucial building blocks in everything from electric vehicle batteries to jet engines to medical devices.

Such a new reserve could join existing government reserves like the Department of Energy’s strategic petroleum reserve and put a Harris administration in competition with Chinese businesses that have long dominated the work of mining and refining these metals.

This idea, which was floated last week in a paper from the Harris campaign, is part of a larger reindustrialization strategy from the Democratic nominee that embraces a Joe Biden-led effort to reimagine the US government’s relationship with manufacturers while also differing from the president’s approach in terms of tactics, incentives, and focus.

She described her overall vision in a recent speech as one that would “recommit the nation to global leadership in the sectors that will define the next century.”

This shift, according to some Democratic policymakers, is necessary after the Biden years saw a surge in new factory construction but lingering worries about supply chains to feed them.

“I kind of liken our re-embrace of industrial policy as a three-act play,” said Jennifer Harris, a top figure who helped lead industrial policy in the early years of the Biden administration.

She is hopeful a Harris presidency could usher in that new chapter, especially around these minerals. “A lot of AI technology buildout is going to involve a lot more rocks coming out of the ground,” she said.

It’s a vision that could, of course, take a radically different turn if Donald Trump prevails in November.

The GOP nominee laid out his own plan for manufacturing recently, focused on a very different approach of ratcheting up tariffs and then limiting government involvement in the sector itself with lower taxes and fewer regulations.

Read more: Trump vs. Harris: 4 ways the next president could impact your bank accounts

Trump has also been dismissive of Biden’s efforts to bring back areas like semiconductors.

“Chips, we’re really starting to go [down] with the chips,” Trump said during a recent speech, completely overlooking the roughly $280 billion in new investments in the sector implemented during the Biden administration through the 2022 CHIPS and Science Act.