Vice President Kamala Harris put the production at the center of her closing message against former President Donald Trump in the battleground state of Michigan on Monday.

“When he was president, he sold advanced chips to China that helped them with their agenda to modernize their military,” Harris said of her Republican opponent during a speech at the Hemlock Semiconductor manufacturing center in Saginaw County.

“That is not about what is in the best interests of America’s security and prosperity, which should be two of the highest priorities for the presidency in the United States,” she added.

Just over a week before the Nov. 5 election, Harris’ manufacturing-focused visit was one of her last chances to close Trump’s lead on the economy in a state that has become an epicenter of emerging U.S. industries such as semiconductors and electric vehicles . .

Before her remarks, the Democratic presidential candidate toured the Hemlock Semiconductor facility, which recently received a $325 million investment from the Biden administration’s CHIPS and Science Act.

“Investing billions of dollars in exactly the kind of work that’s happening here,” Harris said, praising the CHIPS Act, which Trump has criticized. “We created tax credits to incentivize the private sector to do this work.”

CNBC’s October All-America Economic Survey found that 46% of respondents nationally said Trump would be better for the economy in their community, compared to 38% who said the same about Harris. That difference is outside the poll’s margin of error of 3.1 percentage points.

In battleground states specifically, the poll showed Trump maintaining a similar 8-point lead, also outside the 4.0 percentage point margin of error.

The Michigan tour is part of the Harris campaign’s weeklong assault on battleground states. The vice president was in Pennsylvania on Sunday and will visit North Carolina, Wisconsin, Arizona and Nevada on Wednesday and Thursday.

After her Hemlock Semiconductor speech, Harris will tour a union training center. She will then head to Ann Arbor for a meeting with her running mate, Minnesota Governor Tim Walz.

Harris and Trump have each promised a manufacturing boom under their hypothetical administrations, with different ideas on how to make that happen.

Trump has pledged to repeal the Biden administration’s Inflation Reduction Act and has attacked the CHIPS Act. The Republican presidential candidate has put forward a universal tariff policy on all imports as his main strategy for the onshore manufacturing industry.

“That chip deal is so bad,” Trump said Friday in an interview on the “Joe Rogan Experience” podcast. “All you had to do was charge them rates.”

Harris has rejected this tough tariff approach, labeling it a “Trump sales tax” due to economists’ estimates that a blanket import tax would raise consumer prices.

For her part, Harris wants to boost manufacturing through a combination of tax breaks and government subsidies for sectors such as artificial intelligence, clean energy manufacturing, cars and semiconductors.